I've run into an unexpected problem. Visual Studio 2005 is only supported on Windows Vista with VS2005 Service Pack 1. This shouldn't be a problem, except that SP1 is still in Beta and isn't released yet. This means that there is no production development environment that's certified to run on Vista right now.
I installed SP1 beta with some difficulty. The installer would get 90% of the way finished, then back out all changes with no error. After two hours I found a note that said you had to use "Run as Administrator" when running the installing the service pack. An error message would have been nice.
The good news is VS2005 runs well on the new hardware (Core 2 Duo E6600 with 2GB RAM.) There are still some rough spots performance-wise, but they are annoyances as opposed to productivity killers.