Visual Studio 2008 has been good to me so far.

I'm running:

- VS2008 Team System Developer Edition
- Windows Vista Enterprise
- Mac Pro dual duo-core Xeon 64-bit, 2GB RAM, 10K SATA HD, ATI Radeon x1900

If anyone is considering upgrading, here's my two cents:

PROS

- clean as ever, as fast or faster than previous versions
- new project template types
- painless to switch between different versions of the .Net framework
- supports cool new stuff like Linq & Silverlight
- seems very stable; I've used it heavily for about 2 1/2 months now.
- drawing issues that plagued Vista combined with VS 2005 seem to be gone.
- plays nicely with VS 2005 on the same machine.

CONS

- can't open a 2003/2005 project without converting it... this can be a deal breaker unless you are the only one on a project, or the whole team has upgraded.  Make sure not to upgrade a project and check it back into source control unless you are the owner of that code and everyone else using that project knows about it.
- I have seen one error dialog popup repeatedly: "Cannot connect to undo manager".  I haven't see any negative side effects of this error, other than it is annoying to get the dialog (possibly once or twice during several hours of usage).

Recommendation... if you get the chance to install it, go for it.  You can always continue to use VS 2005 for day to day work and try out some of the new features of the 3.5 framework.

- Tim Medora