I'm about to live on the wild side: I'm about to upgrade Wordpress on this site to the 2.5 RC1 sneak peak that was announced the other day. If you see any errors or any problems, please ignore them for the moment.
UPDATE: Well, that was quite painless. I can't say I'm too impressed with the new admin interface. It's certainly very pretty, but why such big fonts and sooooo much white space? This is the "behind the scenes" interface - I want it to be simple and concise. Thankfully there's already an awesome admin theme - Fluency Admin Plugin - (thanks for the pointer Adii) that makes things look much better.
I'll have to play a bit more before I can make any more comments on the new features and functionality.