I just updated this site to the latest code from my sandbox in svn (/branches/joedev2.1). Hopefully you won't notice much difference. The menu is now rendering as ul and li elements using the new CSS Menu Adapter based on the sample from MS. It should look the same as ever in the browser but if you view the source you'll see no more of the nasty nested tables that the menu rendered as previously.
Also the Personalization, Membership, and Roles provider apis have been implemented in all the data layers (this site is using the MySQL data layer).
I'm also using the built in asp.net login control, change password control, and password recovery control which run on top of the Membership Provider.
Personalization in particular is the main plumbing needed to support WebParts and it is working well now in all the data layers so I'm beginning to experiment with web parts and conversion of the built in features to web parts. Its going to be cool. The only thing is the web parts controls all seem to render with nested table layouts so I will probably have to implement CSS Adapters for them before I'm happy with it.
There were quite a few changes under the hood so let me know if you notice any problems or anomolies with this site