Was lucky enough that my company allowed me to purchase a new machine just for VS 2005 and WinFX development.
Got XP+SP2 and VS 2005 Beta 2 installed (only version that currently works with WinFX) and I'm having a ball.
I also have Vista 5231 on a laptop - unfortunately only 5219 works with WinFX, but I'll be upgrading anyway as soon as the next CTP build comes out (hopefully this time with the corresponding WinFx build).
My only complaint so far: not easy to work with XAML. The XAMLpad is really basic, Aurora's tool is not that great and .... there's nothing else. Can we get a beta of the Expression tool for creating XAML?