redford

After going over the release list, there are a few actors who are well represented in HD, topping out at 2 HiDef Films. (Harrison Ford, The Rock,Adam Sandler, Clint Eastwood) but there are 4 who have burst through and are battling it out to be the most HiDef with 3 hd movies each.

Angelina Jolie (Sky Captain, Tomb Raider, Bone Collector)
Denzel Washington(Bone Collector, Manchurian Candidate, Training Day)
Arnold Schwarzenegger(Terminator, T2, End of Days)
Vin Diesel (XXX, Pitch Black, Riddick)

I'm a little surprised Jolie is so well represented, since she has a few films under her belt and only a couple were blockbusters.

Nimbus

Don't forget Karl Urban, who also has three -- The Bourne Supremacy, Doom, and The Chronicles of Riddick.