Hey, I just upgraded from 2.0.4 to 2.1.3, and it rocks! I was especially happy to see you resolve the html code viewing feature in the post editing screen -- I was one of the people using Firefox who had the mysterious inability to see the code for my posts using the old TinyMCE editor. It works great now.
Great job! I love WordPress. I'm running three WP blogs on my personal sites, and I couldn't be happier.