boxee has come a long way from its humble beginnings, and you knew it wouldn't just show up in Vegas without a little something new to share. In fact, a lot to share. Unless our memories are far worse than we imagine, this is the most substantial update on the media software since its inception. After receiving 200,000 sign-ups for its private beta, boxee has announced that it's opening its alpha to all Mac, Ubuntu and Apple TV users. Better still, the Windows flavor is sliding into private beta, and for UK users, they'll certainly appreciate the addition of proper BBC iPlayer support. Additionally, Joost support was added along with MTV Music, and a few new keyboard shortcuts were thrown in for good measure. Finally, a whole slew of bug fixes are included in the public alpha, so we're really wondering why you're still here and not downloading. Hmm? Full release is after the break.