Hacker News Reader

I've been worried about the same thing. A few months ago I scraped all my scrobble data from last.fm with a python script I found online: http://encukou.github.com/lastscrape-gui/

You can even move all your data to libre.fm. I didn't do this because a few of my music programs (ahem spotify) only support last.fm.

You should see this comment about changing your hosts file: http://news.ycombinator.com/item?id=4917367

Libre.fm[0] have a compatible api for scrobbling but it doesn't seem to have had very much activity as a project and you'll have to add an entry to your hosts file (or otherwise alter your DNS) so that applications such as spotify talk to their servers instead of last.fm's.

http://libre.fm/

I would be interested to know too. It would be nice if there was an open way to track listening data, but I assume it would depend on whatever APIs the music player would allow?