I think this warrants a reminder.
If you plan to update your development machine to Vista:
- you won't be able to develop with Visual Studio 2002 or 2003 in Vista (i.e. it won't be fun and it won't be supported)
- you *can* run .NET 1.1 apps created with Visual Studio 2003 in Vista.
Read more here.
My main machine will stay on XP. My dev machine for VS2005 will get updated. My current tablet will probably stay on XP but my next one will definitely be a Vista box.