Is there any chance there will be support for Libre.fm? Since both pidgin-musictracker and pidgin are open source, it would rhyme well to also have support for Libre.fm :).

http://libre.fm/

From a quick look, whilst libre.fm supports the same scrobble API as last.fm for reporting plays, it doesn't have the same webservices API for retrieving the play information (which is what pidgin-musictracker uses), so this isn't quite as straightforward as just adding a configuration option for selecting the hostname for the webservices API