QuickLook trouble -- a.k.a. Finder keeps crashing

Today I tried to install an update for BibDesk and nearly succeeded. Then Finder.app and Dock.app startet crashed, restartet, tried again, whatever they did wrong and -- crashed again.

As it is no fun to work with a Mac without Dock and Finder, which, to add insult to injury, steals your focus every 3 seconds to present you a near useless crash report, I began googling for help.

How? 

With the ever-helpful seperate admin account on the machine.

And what did I find?

Reports about corrupt metadata attached by adobe tools to pictures. As Quicklook had a prominent place in the stack traces, this seemed right. But I didn't use any of the mentioned products (CS3,...).

Then I remembered qlmanage, the command line tool to inspect quick look plugin resolution. And behold! For my user account, quick look asked the half-installed bibdesk quick look plugin if it would like to provide a preview of jpgs. The plugin then crashes hard and takes quick look server and the asking application (Finder, Dock,...) down too. Hmmpf!

After removing the broken Bibdesk.app and "qlmanage -r" to reset the quick look generator list, everything works again.

Phew. 

My next options would have been re-installing the combo updater for 10.5.2. and, if that failed, reinstall Leopard. Not a welcome thought.