http://www.highdefdigest.com/
has a fairly good list of released blu-ray and hd-dvd films as well as release dates, though I think it mainly covers US releases.
Deer Hunter - out on hd-dvd
First Blood - out on blu-ray
Black Hawk Down (I heard Blu-Ray only?) - out on blu-ray
Gladiator - its a universal film I seem to recall so HD-dvd
Commando - Fox film so blu-ray
LOTR Trilogy - believe its coming to both hd-dvd and blu-ray. I'd wait as I recall reading the first release will be the cinema version and not the extended version you can get on dvd.