Re: Snow Leopard Won't sleep with QS running...

[AppleScript]

Activity Monitor>>CPU (CPU in the tab bar below) lists all running
processes above. One of them may be causing the sleep problem. You
have to try quitting the processes (which you suspect to be causing
the issue) one by one and see if sleep works. You might also want to
look in the Console.app log. In any case, you should try the apple
forum since it has nothing to do with Quicksilver in your case.