As if having Sony's own Video Marketplace, Netflix, and Hulu to satisfy the film cravings of PS3 owners wasn't enough, Sony is now adding a fourth movie service with VUDU. 

Basically, VUDU is a video marketplace that allows rentals and purchases of movies through streaming. This is something that the other services on the system don't do, as it is the only one that allows you to purchase movies without downloading them, but it's not a big leap either. 

Rentals will cost about $2 for SD, while HD is a higher $4-6--those $6 rentals get you the HDX 1080p streaming content, which looks fantastic. Signing up with the VUDU service will earn you a $6 credit as well. 

VUDU is only available in the US.