Is there any GUI to view, add, delete assemblies in Global Assembly Cache?
There's also WinGAC which I've seen people use. Seemed to do a good job
CodePlex has a project called Win GAC as well but I don't have experience with it. It hasn't been updated since 2008 and says it supports up to .NET 3.5 but I have a feeling it would handle 4.0 just fine.