Not DVI, VGA. Big difference. I have the VGA cable, and it is nice to have though.I know the XBOX360 has a (whatever the weird console socket it) to DVI cable, so you can plug it into a monitor. The official microsoft ones are about $30 i think, or you can get other ones of ebay for considerably less.
I intend to get one for when i (hopefully) go to uni this year.