WordPress team has released version 2.3 after 3 months of "feverish" work. It is obviously targeted for the adventurous and savvy to test and provide feedback for the final release.

Some of the features of 2.3 include plugin and core update notification, built-in tags support, faster javascript, and SEO-friendly URL redirection.

You can download the beta here.

We are going to use this version to test our plugins with. Additionally I want to explore the tagging features of this release among other things.