dvd is 480p, blu ray and hd dvd are 1080p, generally speaking,,,,,my question is what source does comcast use when playing a movie in hd,,for instance i was watching deja vu on comcast the other night and it said 1080i in my tv display and it clearly blew away the dvd i own. what do they use for their source?????i didnt think a movie could look that much better than a new dvd. Are movies nowadays being recorded at a greater resolution and being compressed for dvd............I thought the titles now for blu ray and hd dvd were basically just upscaled for compatibility, hell no, that picture unbelievable..........