I'd back HD against Blu Ray, cheaper, and like VHS over Betamax, it's the choice of the porn industry.
Blu-Ray is the better disc - faster and more data, its also backed by more film distributors - a major factor in sales, plus the PS3 is going to put a blu-ray player in millions of homes very early in the battle when most consumers havn't picked a player yet.
You'd also be betting against the royalty holder on the CDROM
well they are not actually putting them in millions of homes they are charging over 500 quid. Xbox pwns ps3. The ps3 unit is actually being made at a loss where as the 360 is still operating at its first ever launch price and im sure they have a small prece drop up there sleeves.