I just moved a WPF / WCF application from my laptop to my workstation, and it suddenly started crashing Visual Studio as soon as the project loaded (those darn CTPs). After some hunting and pecking around, I came across this post:

http://forums.microsoft.com/MSDN/ShowPost.aspx?PostID=234330&SiteID=1&PageID=2

It seems that WPF (at least the Feb CTP) will not work on multi-processor machines. I am sure this will be fixed soon, but in the meantime, you have to start VS, then force Visual Studio to use one processor...