I have heard about that, but if you think about it, it only becomes apparant whilst looking at them side by side. Which becomes a case of, does it really matter?
But yeah, I probably will stick to my Xbox 360 for regular multiplatform games, and choose the PS3 of course for ones built only for that system. I only have 4 games for it:
Motorstorm, Resistance, GTP and MGS 4.
Maybe the Xbox 360 will get quieter as time goes on, in which case I can just buy that revision later, but yeah, while playing games in this rather small room, its pretty horrible.