I was just going through the same dilemma. Every thing required ImageMagick... then I finally found this yesterday:
http://www.planet-source-code.com/vb...=1192&lngWId=8
It also generates the thumbnail images if they don't already exist... you might have to change a few things for it to work exactly right for you, but hopefully it's a start.
If you wanna see a quick example of how it looks as-is, check out
http://www.moskie.net/pics/Berlin/