Today I ran WinDirStat to check what is filling up my harddisk. I was surprised to see that this folder contains 4.6 GB (!):
C:\\Users\\...\\AppData\\Roaming
This drives me crazy and hopefully it will be fixed in VS 2010; however, I found another solution to this problem.
My "fix" is to use the "Junction" tool to map the folder to another drive. If you're like me and have a second drive, then you can use window's Junction tool to create something like a symbolic link to map the folder to another drive.
Best of all, you no longer need to use the command line. This freeware tool works great: Junction Link Magic.