As you can see, the new design went live, congratulations on the official launch!
If you see any CSS/Styling issues, please start a new question for the bug report, and tag it with "Design" and "Bug." It will be a lot easier for me to track new questions than reading the comments replied to this thread. A note for IE6/IE7, while we try to make sure the site is functional for people using older browsers, we don't support them to the point of pixel perfectness.
The favicons may be cached by your browsers, to see the new ones, load the following URL in your browser's address bar and hard refresh.
Some tweaks I changed from the original mockup posted: I changed meta text to sans serif, also the comment text too. I agree with @nohat that a combination of modern and old may suit the site better. I've also changed some link colors to be more consistent.
Thank you for your helpful design input, and also thanks to Alex for a great design. Congrats again!
P.S. I'll be hanging out in the English Chat room this week on and off. Feel free to send me feedback there too(although I still prefer bug reports to be posted here on Meta). The English chat room's theme design has been updated as well.