I'm going to be working through the new version bit by bit and updating people here to stop people from reporting bugs over the next few days. The upgrade won't be complete until at least Wednesday.
Please read this thread to give you an idea of everything that needs to be working...
vBulletin 3.7 First Look! - vBulletin Community Forum
Module that aren't working correctly at the moment are...
None of the new Yahoo! User Interface Library (YUI)
The Menus at the head and the smiley popup's in the thread posts
Setting up today....
The Social Group Pages and Image upload options
Friend lists and tagging
Custom Home Pages