Meet the Datel XSata.
http://www.play-asia.com/paOS-13-71-df-49-en-70-1bxf.html
IGN review
http://gear.ign.com/articles/718/718315p1.html
"Sadly, what you can't do is transfer pictures, music, or movies to the 360's HDD. While it would be nice to dump a chunk of your mp3 collection into the 360...