While reading over Scott's list of interview questions (gut-checking that I am at the level I think I am), I came across a really cool tip. You can find any currently running processes that are using .NET using the command-line:
tasklist /m "mscor*"
For instance, the results running right now on my machine:
Image Name PID Modules ========================= ====== ============================================= sqlservr.exe 1292 MSCOREE.DLL sqlservr.exe 2156 MSCOREE.DLL devenv.exe 5708 mscoree.dll, mscorwks.dll, mscorlib.ni.dll, mscorjit.dll dexplore.exe 4144 mscoree.dll, mscorwks.dll, mscorlib.ni.dll, mscorjit.dll, mscorie.dll, mscorld.dll WebDev.WebServer.EXE 4960 mscoree.dll, mscorwks.dll, mscorlib.ni.dll, mscorjit.dll myclickoncedemo.exe 5524 mscoree.dll, mscorwks.dll, mscorlib.ni.dll, mscorjit.dll