I'm looking for the missing piece in the middle. I'm looking for a playlist editor that does smart playlists based on multiple criteria (e.g. rating, year)

I've got a bunch of MP3 files sitting on a read-only share on my server.
I'm using "NomadSync" to keep my mp3 files in sync with my Xen Xtra.
"NomadSync" will take playlists and send them to the player too.

The application needs to work with the MP3 files directly - I don't want any databases (so no iTunes, no Creative MediaSource) since they aren't easily portable between the computers I sync on.

I don't mind hand-changing my MP3 files to add a custom field in if there is a simple-to-use program that will generate the .m3u playlists on demand.

Any suggestions?

Thanks!

Paul