Clever people know that cleaning your keyboard while your computer is switched on might be a bad idea. I did anyway, and as a result my Eclipse window looked like this:
For the non MacOSX experts: You won't be able to click on the right restore button, and there is no such menu entry anywhere. Luckily, Eclipse can be restored using Window->New Window (thanks for the hint, Sebastian). Restarting the application or the computer would not work.
But how's that supposed to work in MacOSX anyway? I found a couple of Applescript solutions, but nothing really user-friendly in the internet. I couldn't even figure out how I got into this situation. Any ideas?