EDIT 6/31/2010: This works just the same for VS2010. The second paragraph below made me smile... I did the same thing when 2010 came out -
You probably should not upgrade any VS Tools project from Visual Studio 2005 to 2008 because - although it works - there are several things that don't work... or are hard to do.
But... that's not me. I loaded 2008 the day it came out.