I just went through the feature list at CMSMatrix.org and found some inaccuracies:
- "SSL Logins" and "SSL Pages" are possible with the securepages module http://drupal.org/project/securepages
- Test Framework is part of Drupal 7 core which is due out in early 2010.
- WebDav is a Free Add-On http://drupal.org/project/webdav
- Database Reports is a Free Add-On with Views, Table Wizard, and Charts http://drupal.org/project/views http://drupal.org/project/tw and http://drupal.org/project/charts
- Expense reports is a Free Add-On with CCK and Views (http://drupal.org/project/cck)
- Graphs and Charts is a Free Add-On with Views and Charts modules.
- Point of Sale is a Free Add-On with http://drupal.org/project/uberpos
Given that this site is used by many decision makers it's valuable for us to keep this updated and potentially work on filling in the holes where possible. For example, cmsmatrix lists "Kerberos Authentication" as an area where Drupal has no solution, but there are recipes in the forums for getting Kerberos by combining Drupal, Secure Authentication module, and Apache's basic authentication configured to use a Kerberos database. If we can solidify that into a good handbook page we've got one more item finished.
Similarly, the Wikipedia entry is frequently used and frequently inaccurate. I just subscribed to the RSS feed of Wikipedia edits and suggest others do the same so we can make sure it stays accurate.

Comments
CMSMatrix.org very out of date
The comparison data for Drupal at CMSMatrix.org is based on version 6.10 provided in Feb-2009. I would say those who have the skill need to update this both for the latest 6.x version and for v7 too. I would be happy to do it but frankly there is alot about Drupal I am still learning.
According to the website here is the current comparison between Drupal/Joomla!/Wordpress:
Drupal 6.10
Joomla! 1.5.10
WordPress 2.2.1
Last Updated
2/26/2009
1/11/2009
7/25/2007
System Requirements
Drupal 6.10
Joomla! 1.5.10
WordPress 2.2.1
Application Server
Apache
CGI
Apache
Approximate Cost
Free
Free
Free
Database
MySQL
MySQL
MySQL
License
Open Source
Open Source
Open Source
Operating System
Platform Independent
Platform Independent
Platform Independent
Programming Language
PHP
PHP
PHP
Root Access
No
No
No
Shell Access
No
No
No
Web Server
Apache
Apache
Apache
Security
Drupal 6.10
Joomla! 1.5.10
WordPress 2.2.1
Audit Trail
Yes
No
Limited
Captcha
Free Add On
Free Add On
No
Content Approval
Yes
Yes
Yes
Email Verification
Yes
Yes
Free Add On
Granular Privileges
Yes
No
Yes
Kerberos Authentication
No
No
No
LDAP Authentication
Free Add On
Yes
No
Login History
Yes
Yes
Free Add On
NIS Authentication
No
No
No
NTLM Authentication
Free Add On
No
No
Pluggable Authentication
Yes
Yes
Yes
Problem Notification
No
No
Free Add On
Sandbox
No
No
Limited
Session Management
Yes
Yes
Free Add On
SMB Authentication
No
No
No
SSL Compatible
Yes
Yes
Yes
SSL Logins
No
Yes
Free Add On
SSL Pages
No
Yes
Limited
Versioning
Yes
Free Add On
Free Add On
Support
Drupal 6.10
Joomla! 1.5.10
WordPress 2.2.1
Certification Program
No
No
No
Code Skeletons
Yes
No
No
Commercial Manuals
Yes
Yes
No
Commercial Support
Yes
Yes
No
Commercial Training
Yes
Yes
No
Developer Community
Yes
Yes
Yes
Online Help
Yes
Yes
Yes
Pluggable API
Yes
Yes
Yes
Professional Hosting
Yes
Yes
Yes
Professional Services
Yes
Yes
No
Public Forum
Yes
Yes
Yes
Public Mailing List
Yes
No
Yes
Test Framework
Free Add On
Yes
Yes
Third-Party Developers
Yes
Yes
Yes
Users Conference
Yes
Yes
Yes
Ease of Use
Drupal 6.10
Joomla! 1.5.10
WordPress 2.2.1
Drag-N-Drop Content
Free Add On
No
Yes
Email To Discussion
Free Add On
Free Add On
Limited
Friendly URLs
Yes
Yes
Yes
Image Resizing
Free Add On
Yes
Limited
Macro Language
Free Add On
Yes
Free Add On
Mass Upload
Free Add On
Yes
Free Add On
Prototyping
Limited
Yes
No
Server Page Language
Yes
Yes
Yes
Spell Checker
Free Add On
No
Free Add On
Style Wizard
Limited
No
No
Subscriptions
Free Add On
Costs Extra
Yes
Template Language
Limited
Yes
No
UI Levels
No
Yes
Yes
Undo
Limited
No
Free Add On
WYSIWYG Editor
Free Add On
Yes
Yes
Zip Archives
No
No
Free Add On
Performance
Drupal 6.10
Joomla! 1.5.10
WordPress 2.2.1
Advanced Caching
Yes
Yes
Free Add On
Database Replication
Limited
No
No
Load Balancing
Yes
Yes
No
Page Caching
Yes
Yes
Free Add On
Static Content Export
No
No
Limited
Management
Drupal 6.10
Joomla! 1.5.10
WordPress 2.2.1
Advertising Management
Free Add On
Yes
No
Asset Management
Yes
Yes
Limited
Clipboard
No
No
No
Content Scheduling
Free Add On
Yes
Free Add On
Content Staging
Free Add On
No
No
Inline Administration
Yes
Yes
No
Online Administration
Yes
Yes
Yes
Package Deployment
No
No
No
Sub-sites / Roots
Yes
Yes
No
Themes / Skins
Yes
Yes
Yes
Trash
No
Yes
No
Web Statistics
Yes
Yes
Free Add On
Web-based Style/Template Management
Yes
Yes
Yes
Web-based Translation Management
Yes
Free Add On
Limited
Workflow Engine
Limited
No
No
Interoperability
Drupal 6.10
Joomla! 1.5.10
WordPress 2.2.1
Content Syndication (RSS)
Yes
Yes
Yes
FTP Support
Limited
Yes
Free Add On
UTF-8 Support
Yes
Yes
Yes
WAI Compliant
Limited
No
Limited
WebDAV Support
No
No
No
XHTML Compliant
Yes
No
Yes
Flexibility
Drupal 6.10
Joomla! 1.5.10
WordPress 2.2.1
CGI-mode Support
Yes
Yes
No
Content Reuse
Limited
Yes
No
Extensible User Profiles
Yes
Yes
No
Interface Localization
Yes
Yes
Yes
Metadata
Yes
Yes
Yes
Multi-lingual Content
Yes
Free Add On
Free Add On
Multi-lingual Content Integration
Free Add On
Free Add On
Free Add On
Multi-Site Deployment
Yes
Free Add On
No
URL Rewriting
Yes
Yes
Yes
Built-in Applications
Drupal 6.10
Joomla! 1.5.10
WordPress 2.2.1
Blog
Yes
Yes
Yes
Chat
Free Add On
Free Add On
Free Add On
Classifieds
Free Add On
Free Add On
Free Add On
Contact Management
Free Add On
Yes
Free Add On
Data Entry
Free Add On
Free Add On
No
Database Reports
No
Free Add On
No
Discussion / Forum
Yes
Free Add On
Free Add On
Document Management
Limited
Free Add On
No
Events Calendar
Free Add On
Free Add On
Free Add On
Events Management
Free Add On
Free Add On
No
Expense Reports
No
Free Add On
No
FAQ Management
Yes
Yes
Free Add On
File Distribution
Free Add On
Free Add On
Free Add On
Graphs and Charts
No
Free Add On
No
Groupware
Free Add On
Free Add On
No
Guest Book
Free Add On
Free Add On
Free Add On
Help Desk / Bug Reporting
Free Add On
Free Add On
No
HTTP Proxy
No
No
No
In/Out Board
No
No
No
Job Postings
Free Add On
Free Add On
Free Add On
Link Management
Free Add On
Yes
Yes
Mail Form
Free Add On
Yes
Free Add On
Matrix
No
No
No
My Page / Dashboard
Free Add On
No
Yes
Newsletter
Free Add On
Free Add On
Free Add On
Photo Gallery
Free Add On
Free Add On
Free Add On
Polls
Yes
Yes
Free Add On
Product Management
Free Add On
Yes
No
Project Tracking
Free Add On
Free Add On
No
Search Engine
Yes
Yes
Yes
Site Map
Free Add On
Free Add On
Free Add On
Stock Quotes
Free Add On
Free Add On
No
Surveys
Free Add On
Free Add On
Free Add On
Syndicated Content (RSS)
Yes
Yes
Yes
Tests / Quizzes
Free Add On
Free Add On
Free Add On
Time Tracking
Free Add On
No
Free Add On
User Contributions
Yes
Yes
Yes
Weather
Free Add On
Free Add On
Free Add On
Web Services Front End
Limited
Yes
Free Add On
Wiki
Free Add On
Free Add On
Free Add On
Commerce
Drupal 6.10
Joomla! 1.5.10
WordPress 2.2.1
Affiliate Tracking
Free Add On
Free Add On
No
Inventory Management
Free Add On
Free Add On
No
Pluggable Payments
Free Add On
Free Add On
No
Pluggable Shipping
Free Add On
Free Add On
No
Pluggable Tax
Free Add On
Free Add On
No
Point of Sale
No
Free Add On
No
Shopping Cart
Free Add On
Free Add On
No
Subscriptions
Free Add On
Free Add On
No
Wish Lists
Free Add On
Free Add On
No
Add Typo3
Add Typo3 v4.5 or soon v5 (typo3.org) cause here in germany it´s the biggest successor of a cms.
Keeping information current
Thanks mori, I appreciate knowing about TYPO3. Very interesting because it looks like it has been a core product in Germany and Austria (but ONLY in those countries) long before Drupal got started. Yet even in those countries WordPress & Joomla seem to have more activity than TYPO3 and Drupal now. See the graph link at the bottom of this post.
However, respectfully, none of this is the point...
The cmsmatrix.org website is used by people to help them decide what CMS's exist and what capabilities they have. It lists literally hundreds of different CMS and quasi-CMS type packages (including TYPO3 and TYPOlite). The point of my comment (and greggle's original post above) is not for D.O to start making bigger and bigger lists comparing Drupal to the other packages, but rather to highlight that we (as a community) need to be keeping our own information up to date on this website and websites like this where people go to when looking to decide what CMS to use.
We are very far behind when it comes to how much web "chatter" is about Drupal .vs. the other leading CMS tools. For some perspective see the following charts:
Drupal through the years
http://www.google.com/trends?q=drupal%2C+joomla%2C+wordpress%2C+typo3
Drupal 2010
http://www.google.com/trends?q=drupal%2C+joomla%2C+wordpress%2C+typo3&ct...
Drupal in Germany -- for mori
http://www.google.com/trends?q=drupal%2C+joomla%2C+wordpress%2C+typo3&ct...
Success is mine! It took me
Success is mine!
It took me from December of 2009 to gain control of the CMSMatrix page, but I now have it. If you notice anything wrong on the page please let me know and I'll do my best to update it!
knaddison blog | Morris Animal Foundation