Finder does not display external devices

Today when I woke up, and turned on my macbook, and connected my time machine and 'general use' disk, they didn't appear on the desktop. Not in the finder under devices either. According to terminal they're both mounted. Other programs can access files on the disks. Time machine cannot seem to backup however, and spotlight indexing also seems to fail on the other disk.
I can still access files on them through spotlight (although I didn't remember the name of any file on the time machine disk, so no good there), and thus eject one of them by dragging the window icon into the trash can.
The time machine disk is USB, and the other one Firewire. I have never had this problem before, and Leopard has worked just fine two days before this.

Go to Finder "Go" menu hold the option key and choose Library. Then go to Preferences trash these files:
com.apple.finder.plist
com.apple.sidebarlists.plist
Then, restart, or log out and in again.
(You will have to reset a few finder prefs the way you like them.)

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