WRT your edit: This reminds me of a service idea I had a while back which I shelved for far too many reasons: A site/chatroom-esque thing where you can invite people to watch things with you over the net (inspired by my long-distance relationship at the time). I'd originally thought of Megavideo, but youtube movies was even better (read: more legal). Advertising would have been fairly well-targeted, judging by the video these people were watching. Free idea, anyone?