MusicBrainz Rating System
Rating is a new feature which is currently being develloped (Oct 2008), and which should be integrated in the 2008 server release.
Users will be able to rates MusicBrainz entities (artists, labels, releases and tracks) like on last.fm.
Each user will be a number between 0 and 5. Then the system will aggregate users ratings to compute the average rating.
Only the aggregate rating will be display with stars. Individual rating will be only shown when viewing the affected entity in order to save server load.
wget --user=<editor name> --password=<password> --post-data=id=8f6bd1e4-fbe1-4f50-aa9b-94c450ec0f11\&entity=artist\&rating=3 http://test.musicbrainz.org/ws/1/rating