What exactly is this doing if it is not anamorphic? I've had multiple DTV boxes and all of them had a 16:9 switch but it never did anything. I have the RCA UltimateTV and I just assumed from the behavior that it was using anamorphic signals (several channels including ER on NBC, HBO, IFC, FMC)...
Fight Club - multiple commentaries
The Matrix - the white rabbit feature, loads of extras, great use of surround sound
The Phantom Menace - Star Wars in widescreen & 5.1, it makes a difference