HDMI and DVI transfer the exact same information... with the exception of audio, which DVI won't handle. Oh yeah.. and the connector is different.
I spent $40 at monoprice.com a few months ago and got two 6 foot HDMI to HDMI cables, two 6 foot DVI to HDMI cables, a charging base for my WII controllers, a component cable for my WII, and three LCD screen cleaning kits.
My HD TV only has one HDMI input.. but it has two DVI inputs, two component inputs, one VGA input, and one composite input (all with their own separate audio inputs). I use one of the DVI adapter cables for my blueray player to use one of the TV's DVI inputs. It works great!
I also recently obtained a sweet computer monitor (24" HP Hdmi in one of those $8 random grab bag deals).. but my video card doesn't have an HDMI output... luckily that extra DVI adapter cable worked perfect for that as well!