Thumbnails with autodetect orientation (from exif data)

Moden digital cameras store the picture orientation in the image, and most software autoamtically rotate the image as needed.
Unfortunally wuala thumbnail generator does not respect these exif infos and the thumbnail has the wrong orientation.

A example of such a wrong thumbnail is here: http://wua.la/MiniTux/Wuala/Wuala+Pub...