I upgraded to the Parallels Beta, and so far so good. Everything that I do day-to-day (I live 80% of the time in Parallels) works fine, including the July CTP of .NET 3.0.
The big bonus for me is the fact that shift-F11 is no longer passed back to Mac (which used to cause the Parallels window to slowly slide up to the top). This means that when I’m debugging code in VS.NET, I can now step out of the current method again!
The really big feature that I’m waiting on is NAT support. Hopefully that one makes it into the next release …