Sidebar (widget area) descriptions in WordPress 2.9
How to add descriptions to individual widget areas in WordPress 2.9 and why this is a useful feature for end users.
Everything you need to know about WordPress 2.9′s post image feature
An in-depth look at how the post image feature in WordPress 2.9 can be used from the perspective of both end users and developers.
Excerpts and taxonomies for pages in WordPress 2.9
How to make use of a simple file change in WordPress 2.9 to add an excerpt box and custom taxonomy boxes to your page editor.