I have Windows Vista Home Premium x64 SP1 & Visual Studio 2008. It's work very good. But when I installed Visual Assist X 10.4.1640.0 (I try other builds too) on my computer, DEP (Data Execution Prevention) close process "devenv.exe". P.S. I am sorry for the English.
As the FAQ explains this should have been fixed quite a while ago now. I am off to install SP1 on my Vista 64bit test machine and see if I see any problems with VS2008.