The new version includes plenty of new features on both the user and developer sides, including a global “trash can” for posts and comments, basic image editor, rel=canonical support, native support for post thumbnails (should your theme activate the feature) and an updated new Press This bookmarklet.

TechnoSailor has a 10 Things You Need to Know About WordPress 2.9 guide, which covers some of the more interesting features.

So take five minutes to upgrade your WordPress installation. Be sure to make a backup of your database first, since 80% of you probably don’t do it on a daily basis like I do.