RJ just announced that he, along with the other two founders of Last.fm are leaving Last.fm. Details in this post: Message from the Last.fm founders, Felix, RJ and Martin. This is a big deal. RJ, Felix and Martin laid out the roadmap that just about every music 2.0 company would follow. They continuously brought new innovations to music discovery that are now standard for music sites, innovations like scrobbling of music taste, web services to allow access to all of their music data, social tagging of music, recommendation radio, to name just a few.
I hope that the folks remaining at Last.fm will keep the vision of Felix, RJ and Martin alive, and I wish Felix, RJ and Martin the very best in their next venture(s). (I guess it is time to pay really close attention to playdar).