Yes by decent compression i mean h.264, The previous poster said that the download would be 50 gig, given that HDDVD uses h.264 and only stores 15gb per layer (and does 1080p) a 720p feature could easily be only a few gig without the extras. You may like extras, I don't, i never watch them. If apple does release HD downloads they will only be 720p because thats the max the appletv supports.
Well 1080P is the standard on HDDVD and Blu Ray with high bit rates(epsecially higher on Blu Ray) and uncompressed audio. It's nice for people to have an option to choose weather they want 720P or 1080P. Seriously though why go with the a lower resolution, lower bit rate and more compression(as you want) when it has been proven that 1080P content displayed on a 720P native monitor looks better then 720P content? I would be guessing most people would rather go with the more pristine image and audio. By the way you forgot about uncompressed audio it would be a more then just a few gigs with 720P video and uncompressed audio or do you want that down res'ed to dvd audio also? I'm sorry but HD buyers are going with the higher res, less compression, uncompressed audio and higher bit rates. The movie 300 sold 250,000 HDDVD's and Blu Ray's combined in it's first week of release. The millions of HD buyers are gonna go with the more pristine image and better audio. Why go lower? I just don't understand.