One thing I found to be funny is some movie rentals d/l on Xbox Live 720p are 4 gigs with 5.1 surround included. Clean, but not 1080p though. Pirates 3 was like 7.6 gigs with 5.1 surround, ouch. I found it is cheaper for me to rent with my 360 than to drive 35 min round trip to Blockbuster. Of course, the Netflix mail order is nice and all, but I like to watch a movie right away and I change my mind often.
I usually buy movies that won't see the light of day on HD format for many years or I already own the ones I would buy on HD. Standard DVD movies I bought recently: Fist of Legend (Jet Li), Orgazmo (Trey Parker), The Punisher (Dolph Lundgren) and Split Second (Rutger Hauer). So I am just not really ready yet, and I don't want to spoil myself to make DVD look like what VHS looks like to me now.