Rockbox Ports are now being developed for various digital audio players!
Doesn't iTunes use a database for all of that stuff? Rockbox just uses standard M3U playlists so I'm not sure what you mean by storing the rating in the playlist.
Try here: http://www.rockbox.org/twiki/bin/view/Main/UsefulTools#Playlist_Tools
Page created in 0.108 seconds with 70 queries.