Every now and then, when I have a remote desktop connection open, the clipboard fails to copy across the sessions. It's usually the remote to local copy that's borked. It's pretty easy to fix, but I can never remember what I need to do to fix the connection.
[Edited on 1/30/08]
There is a command line way of resetting rdpclip, so you can roll up both steps as a batch file
taskkill /IM rdpclip.exe