Marco Shimomoto's dashboard

I would like to keep my stars, play counts and tags forever. It would be good if we had a mix of last.fm and xmarks to store our own info on each music.
I have a player on my computer at work, another at my media PC and my eveything PC. I move my files between them using either USB drives or mp3 player.
It is always a mess, I mean I don't do messes but play counts and star ratings are different everywhere.
I had similar problem with bookmarks for my Firefox until I found xmarks. It was great and saved me a lot of time.
So I think we could have something that falls between last.fm and xmarks for music libraries.
The itunes sync does part of the job, it would have to consider only the current local files.