I just registered to say I love this site and I love these discussions.
We can expect to see a quite bigger (not substantially but still) figure for the PS3's monthly sales in March. With games like Motorstorm and God of War 2 you can pretty much bet on it. Someone here said that GoW2 will boost only the PS2's sales and not the PS3's but that's not entirely true; If you want to buy GoW2 and you know what a PS3 is compared to a PS2, why not get the more superior console? One might argue because of the large gap between the prices but then he might think "The PS3 is next-gen, and is actually a one time investment in the future of gaming, and it has a blu-ray player in it, and it has a free online service and it can play half of the PS2 games (For PAL territories) and that figure is gonna grow with time". In a nutshell, GoW2 IS a system seller for both consoles and it is without doubt a Killer-app, so either way, Sony wins this month.
BTW, GoW2 was created by Sony so you can't help but wonder how God of War 3 (If it comes out, though rumors actually confirm it) would look like on the PS3 running on 1080p.
And on the same note, that entire "If you don't have an HD-TV you can't play the PS3" (LOL rhymes) arguement is total BS, IMO. Just as there are 360 players playing their games on a normal TV and enjoying it, there are PS3 players who do the same thing and enjoy it just as much.
Just my opinion...