I want to take into account ONLY games that will drive hardware sales, a lot of the games both have mentioned are meh games that 'already' owners will pick up, it is not going to cause people to buy the console and not going to have HUGE sales.
PS3 System Sellers
GTA4 - Of course
MGS4 - In the US this one will be good
LittleBigPlanet - Appeals to a new spectrum of players for PS console, I think this will have moderate success and is a reason to buy the console, less than the other games above though.
FFXIII is not going to come out this year
PS3 Decent Games 2007
All of the rest below here have my thoughts
DMC4 - never been a system seller, sells good to PS owners
AC - good game, but never a big seller
KillZone2 - Too much is riding on it being the same as the E3 trailer, and that's not going to happen, this game will be OKAY in sales, will not drive hardware.
Heavenly Sword - Awesome looking game, will probably be good but meh on sales front, won't sell systems.
NGS - whats this?
Lair - great graphics, looks okay, wont drive hardware, it's too niche
Uncharted - I don't know much about this but it doesn't appeal to me, and I doubt it is going to drive hardware.
Ratchet - Never been a system seller, awesome graphics awesome game, but not going to drive hardware.
MotorStorm - Pretty graphics, mildly fun game, hasn't pushed hardware
VF5 - Already shown to not sell consoles
Warhawk - This is not a big title for the console
Wii System Sellers
Wii Sports - Will drive sales all year.
Wii Sports 2 - It will arrive this year (my prediction)
Wii Health Pack - MASSIVE market penetration, sales of this will go THROUGH THE ROOF.
Mario Party 8 - Mario Party games are always popular and will help drive sales throughout the year consistantly, new gameplay style of particular importance to this game.
MySims - MASSIVE system selling potential, I don't need to justify this.
Metroid Prime 3 - I'm in two minds about this, I don't think it will hugely push hardware, it will sell AWESOME to already or going to be owners but isn't going to push new users... it stays here because I think it's a big thing for the system this year.
Mario Galaxy - Next Mario Game, Nuff said
Super Smash Bros Brawl wont come out this year.
Wii Good Games this year
Super paper Mario - appease Nintendo games, might push hardware slightly, but not a huge bump up for this game - not 'platform mario' enough to perform like NSMB
Wii Music - Good game for the New players that bought for Wii Sports and got WarioWare, WiiPlay etc, not going to push hardware1
Zelda: TP - it's already out it's pushing sales decently but not for much longer, not much strength left in this
Fire Emblem - totally niche game in the western world, isn't going to sell huge.
Pokemon Revolution - never as big as the handheld games, no one will buy a Wii for this, 'aready' owners game
Big Brain Academy - I'm in two minds about this, it suits the people that have bought a Wii for the new way of playing but I doubt it will drive hardware, people wont buy a Wii for this.
PROJECT HAMMER - Wont come out this year.
DAY of Crisis - Meh 'Geist' game.
Battalion Wars 2 - First one didn't sell greatly, will perform average and make Nintendo fans happy.
Mario and Sonic Olympics - I'm also in two minds about this, I think possibly this one will move hardware, but I don't think it will be ULTRA big so it goes in this list, it helps to bolster the Wii lineup.
Mario Striker Charged - Online play is good for Nintendo games, won't sell great, hardcore Nintendo fan game.
Sadness - Wont make it this year.
Nights - excellent core gamer game, only known by hardcore gamers, can see a million seller, Sega / Nights fans that haven't bought a Wii will buy a Wii for this game, will push sales but wont be a massive system seller.
Dragon Quest Swords - Dragon Quest isn't as strong outside of Japan, will do well in Japan but isn't that huge in the US and EUR
Final Fantasy Crystal Chron - MEH, the GC one sold like crap, this will be similar, will appease Nintendo fans for their FF fix, will not push hardware.
I think that is pretty fair across both platforms (don't you?) sprouting a list of games with nothing to back it up doesn't do much there are a lot of crap on both fronts, but in terms of sales I think the Wii is going to do much better this year.