The release of WordPress 2.6 is now official. In addition to the features I highlighted previously, Ryan has details on his blog about the improved support for SSL, and some new helper functions which will be useful for plugin and theme authors. And the official dev blog post has details on other new features. One of the more interesting things that I didn’t yet know about was that the Press This bookmarklet has some nifty autodetection which will make it easy to automatically embed content from sites like YouTube and Flickr.
In addition to the new features, I’d also like to point out that there has been a recent effort to improve the inline source documentation (using PHPdoc). I, for one, certainly appreciate the work that is going into documenting the parameters, return values, and purpose of each function. It make things much easier when you have to trace back through the call stack to figure out where certain things happen.