Being a recent convert to the way-cool iPhone 3G, I thought it might be helpful to have a thread for Drupal-related iPhone productivity.
Here's some starters, (and thanks to realityloop):
Drupal Notifier
http://drupal.org/project/drupal_notifier
Cydia
http://theiphoneproject.org/?page_id=36
There's a web app version of the O'Reilly "Using Drupal" book ($5.99).
http://toc.oreilly.com/2009/03/oreilly-ebooks-now-in-stanza.html
(But don't follow the instructions at that link, it will cost you $35 instead of $5 - instead, search for "using drupal" in AppStore/search on your iPhone or desktop iTunes. You'll need the Stanza web app from AppStore first, which is free, and will enable you to download heaps of free out-of-copyright books.)
I've paid the $5 - I'll let you know if it was worth it.
Here's the relevant Drupal Group:
http://groups.drupal.org/optimizing-themes-modules-iphone-use
Some general iPhone stuff:
Applulous
http://appulo.us/appdb/
iiQuota allows you to easily monitor your Phone/ISP usage directly on your iPhone ($3.99):
http://www.southfreo.com/iiquota/Home.html
Realityloop's best of:
http://www.realityloop.com/blog/2009/06/26/some-must-have-iphone-apps

Comments
AMSU
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To install Cydia you need to Jailbreak your iPhone, which you can do with RedSn0w
The most useful apps I have so far:
Things (To Dos): http://culturedcode.com/things/iphone/
Colloquy (IRC): http://colloquy.mobi/
Sygic Australia (turn by turn GPS): http://itunes.apple.com/WebObjects/MZStore.woa/wa/viewSoftware?id=319361...
Cydia apps:
SB Settings (Quick access to key settings)
Winterboard (iPhone Themes)
Smoog theme for winterboard and SBSettings
Backgrounder (run multiple Apps)
RemindYou (upcoming calendar items on Lock Screen)
@BrianGilbert_
Help make Drupal Melbourne meetups more awesome:
http://groups.drupal.org/node/204518
The best way to grow your local commununity is by participating in it!
Hi, Blogpress works
Hi, Blogpress works excellent with drupal through new blog-api (http://drupal.org/project/blogapi_new).
I love my Iphone and I love drupal. To combine those is great!
Greetings,
Martijn