I wrote a script that uses OnSongChange to trigger submissions to last.fm (using lastfmsubmitd), but one that waits until the song is half played before submitting. This way skipping through tracks after a few seconds will not cause submissions to last.fm.

Script is here:

http://files.lukeplant.fastmail.fm/public/moc_submit_lastfm

Blog entry:

http://lukeplant.me.uk/blog.php?id=1107301687

It can go into contrib if wanted. IMO, it is nicer than current script in contrib that does this, since it waits for an appropriate length of time rather than submitting as soon as a change is noticed (and also: it doesn't require a background process to be run first, and doesn't depend on the 'lastfm' python module, which doesn't seem to be the same on my system).

Luke