It has two DVI inputs, and if you're spending the money to get both an HD and a blu-ray player, I assume you've probably also got a sound system attached to it. You can get an HDMI to DVI adapter and get the exact same picture quality, just not the sound.
You need HDMI inputs for HD DVD and blu ray to get max resolution.
"You can get an HDMI to DVI adapter and get the exact same picture quality, just not the sound."
Won't work on a second gen HD DVD player manu by Toshiba.