Sites:

  1. Check on plug-in compatibility – http://railsplugins.org/home
  2. Great Notes on the upgrade, bundle, boot, haml, config, cross site scripting, etc. http://rails3.community-tracker.com/permalinks/5/notes-from-the-field-upgrading-to-rails-3
  3. Plug-in handling, conversion to gem – http://www.litp.org/blog/?p=128
  4. Error Validation Messages, – http://www.emersonlackey.com/article/rails3-error-messages-for-replacement
  5. More notes, a lot about xss – http://rbjl.net/24-upgrading-to-rails-3-obstacles-and-helper-scripts