I have been using last.fm since last December and so far I have been loving it. (You may remember it as audioscrobbler.) Over 4000 songs later and I have finally decided to put what I am listening to on my site. I found a plugin for wordpress from sevennine.net installed it and everything is up and running. I still need to do a little work to the way the tracks are displayed, for instance I think I will add a nice little icon or something beside each track, but it is way too late to do anything about it tonight. It is currently set to update from last.fm every 10 minutes.