Thanks to babybean, I got a code to acess the uncharted 2: among thieves beta for Playstation 3. I just want to say, all the hype for this game, it's defenetly worth it. The beta is AMAZING. I will be putting up some articles from the beta here so you can hear my impressions of it. Firstly, I will post what you get to do in the demo/beta:

Multiplayer - you go here to play.
According to IGN, there is 4 competitve game modes (I have only played eliminations)
There is 2 co-op modes, Gold Rush/Arena, and normal objective based game.

Trailer - Watch the uncharted 2 trailer

Options - Your basic options like invert axis, brightness, audio settings and twitter account management

Medals - View the medals you have received in multiplayer (medals you get when completing a certain challenge.)