• Collaborative book. While Kairosnews users can still add and edit
  Do You Blog? Weblogs for Educators, there is no visible "edit" link. To edit a page in the book, just add "/edit" after the url.
• Trackback. Trackback seems to be autodetecting incoming links on it's own, including internal site links. Kairosnews editors will have to remove those new trackbacks by "unpublishing" them. So if you see some strange comments listed in the recent comments bar, that's probably one of those.
• Comment tracking. The upgrade script failed in one respect. Drupal no longer displays the accurate number of comments for a post in the main page display until after a comment is edited or a new one is added to the post. So none of the 3,000+ comments on Kairosnews disappeared; just click on the post and they will display.

Hopefully, these problems will be taken care of as Drupal is refined for a subsequent 4.5 release.