The dmesg output looks like bad news. If your 2.6.3 kernel had all USB support enabled I think you may be out of luck.
There seem to be many, many different models of pen drive/mp3 players around. The one I checked out did not even work directly in windows, and could only be accesses through the supplied driver software.
If you can try it in windows, and it gets recognised immediately as a removable drive maybe you have a chance to get it working in linux. But if even windows needs a special driver, what chance have you got?
Only t-logic hit I got from google was:
Mp3 reader adapted to the young people, much colorful one and from the rectangular shape