The Akismet module seems to take away allot of the comment/node spam, but still doesn’t work effectively on the other area's of Drupal. What Akismet for those who don’t know it does three things detect spam, mark spam, unmark spam. Though it cant really solve the problem of register spam or other modules spam as good as it does for comments/nodes. So what values can we work with ?
comment_type
May be blank, comment, trackback, pingback, or a made up value like "registration".
comment_author
Submitted name with the comment
comment_author_email
Submitted email address
comment_author_url
Commenter URL.
comment_content
The content that was submitted.
Currently the problem of the Akismet module for Drupal that there is no real system to prevent spam trough registering and spam already starts to slowly move into modules as Organic Groups and contact forms. As the number of amazing modules will grow, so will the possibilities of spam systems for these specific modules.
There is a certainly the better Drupal will get the more likely there will be spam, so this problem could be worked out with Akismet but does it really work for big communities?
Without hurting the user-experience of the user by adding captcha, previews or even more required forms.