But now I solved the problem. =P
Stupid me...
I recently got a 21" TFT monitor, a nice upgrade from my 19" CRT. But 2 days ago I wanted to test dual display, so I connected the 19" and tested the extended desktop by moving some of the tools to the 19" screen.
But because of desk space problems, I chose not to keep it, and disconnected it without putting the tools back to the primary screen. No wonder I haven't been able to see the outliner when it has opened up on another, nonexistent, screen. =D
Do I get the week's dummy-award now? =)