This is super cool! I've been wondering if there could be a better browser-based community experience in real-time. The now defunct Turntable.FM was great for music lovers and offered chat, however it was hosting copyrighted music and that didn't work out in the end. If you could sit in a virtual roundtable, on one of your browser tabs, and share music, or any other media - with space on the sides for annotations/chat... then I think you're onto something wonderful.