Visual Studio 2008 Beta 2 was recently released and it is now to the point where one could use it on a daily basis. For me, there are a few things that are stopping me from jumping ship from VS2005 straight to VS2008 Beta 2. A few of those revolve around the ability to install guidance packages such as the Web Service Software Factory for WCF and a few others.
The good news is More Wally has already taken the plunge for those of us that are procrastinating and is reporting his ups and down with VS2008 in a series called Life With Visual Studio. Keep that on the radar as he works through converting projects, etc.