Mac only (for now): The ATV USB Loader, a free tool to boot third-party software on an Apple TV unit, has updated to include the slick media centre Boxee amongst the booting options. We liked Boxee's new looks and social flair when it was available for Macs (and, later, Linux), and the Apple TV implementation looks just as crisp. By loading Boxee, Apple TV users get access to nearly any kind of unrestricted video or audio files, can send recommendations to friends and stream Last.fm tunes, and do nearly anything else in the (currently invitation-required) Boxee. Of course, ATV also maintains support for Xbox Media Centre. If you've grabbed Boxee and tried it out on Apple TV, share your likes and wants in the comments.