It could be something unique to my setup, but I've had Resharper 2.0 installed for about an hour now, and it's crashed or sent VS.NET 2005 into an infinite loop at least 4 times now. The first time was right after I loaded my solution (contains two web projects, two class library projects, and one setup project). I waited for it to recover, but it just sat at 100% CPU usage, so I killed it after about 10 minutes. I reopened the solution, and loaded pretty quickly. I tried to build the solution, and it seemed to compile fine, but started using 100% CPU after it was finished building. I killed it again after 10 minutes of waiting. I loaded it again, and it built fine, no hang. I opened a file, bam, crash (this was just a C# code behind file for an ASPX page).
For something that's supposed to come out in May, I'm hugely unimpressed, which is a shame because I can't live in VS.NET 2003 without Resharper 1.5.