Auran Andar
I'm so happy about my birthday present! I received it one week early :) It's called Panorama Corrector 2. It's Windows only, but thanks to Wine and Irfanview it works perfectly under Ubuntu.
With it I can remove any kind of perspective distortion from my photos with a few clicks, resulting in perfectly vertical and horizontal lines. I will post some examples after I do more work with it.
