VS2008 install notes: Took about 1 hour and 15 minutes to install (not bad really - way less than the Visual Studio 2005 SP1).
But, if you are installing VS2008 to get at Silverlight 1.1, hold off for a little while and stick with VS2008 Beta2 - the Silverlight 1.1 add-in is not ready yet.
Codekana is working just fine in VS2008
Regionerate 0.6.6.5 - Seems to work fine
GhostDoc 2.1.1 - Seems to be working as well
Found another really good post on the release (from Norway)(http://blogs.msdn.com/mcsnoiwb/archive/2007/11/19/visual-studio-2008-and-net-3-5-released.aspx ) lots of great links and info.