I've noticed that 768p TVs, which were the norm until recently, have begun to get quite scarce. Screen prices are free-falling, and all the idiots want 1080p screens -- which is okay if you are planning on using them primarily for Blu-ray movies, but not for gaming (as I've sorta explained already, and as I will get around to explaining in more detail at some point).
So since 1080p screens are getting so cheap, and since that's what everyone wants because they don't know any better, manufacturers have been ramping down the production of 768p screens, and perhaps in a few months will cease making them altogether. This will be a little tragedy for fans of high-quality visuals, following up on the twin tragedies of the extinction of CRT TVs and monitors.
Note that, barring an HD CRT, the best solution for the 360 and the PS3 remains a good quality 720p projector. But for various reasons, including convenience, a 768p LCD or Plasma screen can be almost as good, especially if it has an option for 1:1 signal display (i.e. if you can feed it a 720p image and have it displayed at 720p with black borders).