I'm very impressed with Boxee from boxee.tv. If it talked to AirTunes, could manage a DVD player and could see iTunes playlists, it would be perfect. I rather expect it will get the first and last of those with some beta updates. Now that I have my big HDTV it looks amazing, though of course now the low rez internet shows are painfully, well, low rez.
Still, I get to see the Daily Show and Colbert without having cable and don't ever need to worry about there being nothing on TV any more. Never again ET tonight, never again Jeopardy.
Boxee has an interesting social aspect (like every other web site these days) but there's no way to find out if friends of yours are using it unless they tell you. No "import your email address list" feature like Linkedin or Plaxo has.
So, if you're someone I know and you're using Boxee (or want to try it and have a Mac) let me know. I'll add you, or send you an invite.