Sorry for offtopic, but a few days ago i read a post here from Matthew Mastracci.
He mentioned his problem with the file locking bug in Visual Studio. This is a very annoying bug and i read many post about it in the past.
If you have big solutions, assemblys > 64k and vs shows this error:
*Cannot copy assembly to file \bin\Debug\Release\]]>.dll. The process cannot access the file because it is being used by another process. *
You should take a look here
This is a HotFix for Visual Studio that solves the problem