Oh, cool! I didn't know. I have jailbroken mine a week ago, and have xbmc/boxee running on it. I can stream movies online, download torrents, watch hulu and others, and stream off my computer...and most importantly, it can now play any kind of media file as long as it's not 1080p, without having to convert anything! What I am describing is just one percent of the an icebergs tip! Best 70 bucks I have ever spent imo!
The hardest part was working around the beta for boxee...since the site isn't around anymore, and no new sites have updated their info yet.
though, my jailbreak is for the old atv, not the new one.