I heard there was a british movie based on HL1, but valve turned around and halted them from releasing it because it wsa turning out so horrible.
I've heard that form alot of places but I don't know if it's true ... because I personally have never been able to find it online ... while others "have been able to"http://imdb.com/find?q=Half%20Life;tt=on;nm=on;mx=20
but there are bad movies coming out named half life,
HL1 Movie would be superb, HL2 movie .. well HL2 is a little camera shy .. it's 100% game. Still, I'd love to see both ... or hell even a Metal Gear Solid anime that went without the bad comic relief/bad anime indulgences.