i absolutely love last fm! used it over the last few months to discover tons of ace ambient post rock bands, awesome stuff. i've tried out using the 'powerplay' promotion tool, where you pay for your music to be targetted to the people you think will love it with similar artists and stuff. People who listen to it know it's being played to them through that, so it's still legal and not too rude and stuff. It's pretty effective though, i decided just to try it out, paid 11 quid for it to be played to 100 people that would potentially love it, and of them about 20 people 'loved' the track. I suppose you could say that we got 200 plays the other day on myspace for free, but i just think last fm users are much more open minded about actually wanting to explore the artists they hear, and are much more likely to go and see them/buy an album/listen to it all the way through. subscription is nice too, not loads of benifits, just more radio stations, no banners, and better service in general. only a few quid too.