When I upgraded to Tiger, I did a clean install and used the migration assistant to copy over my applications and settings. Unfortunately this copied over some Safari plugins (such as PithHelmet) which trashed Safari. I looked up how to fix this, and was told to delete my SIMBL directory (I'm not at my Mac but I believe it was in Application Support or something like that). I did that and Safari worked fine. Unfortuately, now I can't empty that SIMBL directory from my trash because it is "currently in use." Its even currently in use if Safari is not running. How can I find out which process is using it?