Splinter Cell: Conviction
Great game. It's up there with MW2 I'd say.

I've reached a point (where I assume is) near the end which is so ridiculously difficult I haven't played it since I rage-quit that time. All elements of stealth are abandoned at this one tiny part, which is hopeless when playing on Realistic mode.

Still, up until that point it's been a very fun, challenging game that I thoroughly enjoyed.

Warioware D.I.Y.
Awesome, fun game if you would enjoy creating crazy little microgames.
(I made a twin towers one...Perhaps in bad taste )

Split Second. Best car racing game I've ever played. It's actually exciting, even when playing against AI.
Here's a vid you can watch which tells some of the game's dynamics: http://www.youtube.com/watch?v=maT5rnJPIn0
And another showing one style of gameplay: http://www.youtube.com/watch?v=lGnBLk2_P5o
That heli is a real bastard. It only shoots 3 missiles in the beginning, but later on it shoots up to 8 or more in even tighter formation.
Another, similar to that, it has semis cruising along dropping barrels of explosive goodness across the entire track. Very difficult.
I've only played up to episode 3 so far (just started). There are 12 episodes. Each episode has 5 races of varying types. 1 is a bonus race you unlock by earning enough points / wins.
Speaking of points, they help you to unlock new cars and bonus quickplay events.

Get the game any way you can. It's well worth the effort. (I got it on PC)
I bought an Xbox 360 controller specifically for this game. It really needs a gamepad of superior quality.

Since I got a new graphics card, I got Red Faction Guerrilla back, and it is more awesome than ever. Gotta love the destruction.

Speaking of, Burnout: Paradise City is also awesome. I was a fan of the other Burnout games on console and now I have Burnout Paradise on PC I'm loving it. The crashes are such fun.

EDIT: Oh wow that Split Second game looks awesome. I'll definitely check that out.

Xmen Origins Wolverine 360 - pretty cool
Batman AA PS3 - I have it on 360 but its such a cool game i wanted it on both systems
Prince of Persia 360 - just started it very pretty to look at
Mario Galaxy 2 for the kids

Pretty much finished Crackdown 2, need to get 4 achievements for it. Gonna play it more of course cause it's what I have right now. I wanna get Death Spank on Xbox Live Arcade, pretty cool Medieval hack in slash RPG with some comedy elements to it. 1200 Microsoft Ponits which is $15.

I saw that, and thought it looked interesting, then when the review came out on GameTrailers I watched it, because GT Reviews pretty much tell you everything you need to know about a game. It looks like a game I'd enjoy.

Meanwhile, I got Prince of Persia and finished that up. Fun for a quick play-through, maybe a second play-through if you want to max out all your powers. Didn't have the same replay value as a game like Mass Effect, and I have limited space on my hard-drive so I deleted Prince of Persia and re-installed Mass Effect 2.

In other news, I've started a fourth character in Mass Effect 2. Love that game. I've also been playing Mount&Blade: Warband, which is very fun. A few small, but significant and noticeable changes from the original Mount&Blade. Since my graphics card upgrade I decided to get GTA IV back, now I can finally run it lag free while still looking good. Which means I've finally been able to play through the story! I still haven't finished it though, got bored of having to do all those activities with my 'friends', gets so annoying.

Oh yeah, and Team Fortress 2 is something I play daily. It seemed to obvious to me I almost forgot to mention it. Love that game.

still finishing metal gear Solid: Peace Walker.