Well I just applied for the Visual Studio 2005 SP 1 Beta Program through Microsoft Connect. When I mentioned my recent Windows hangs in A Feature You Don't Ever Want to See it seems like it may be related to VS 2005 running. I can't say definitely it is VS 2005, but I want into the Beta if they will have me.
This was all prompted by this Visual Studio 2005 SP1 Beta and Visual Studio support for Vista post. Talk about burying the lead, me that is, but in that post, it is revealed that VS.NET 2002 and 2003 are not going to be supported on Vista, so for anyone that needs to develop for .NET 1.0, 1.1, 2.0, or 3.0, XP SP2 will be it, well, forever. You are going to need a VM, or even more likely another machine to see the full Vista UI meal-deal, but you are only going to test on Vista or develop .NET 2.0 + 3.0 applications only with VS 2005 on Vista. That situation isn't possible for me right now, so it looks like I will be running XP as my main development OS for the foreseeable future, and so will a lot of Windows/.NET developers.