Steam for PS3 Portal 2 detailed - GameSpot

Puzzle-platformer will offer cross-platform gameplay, matchmaking, friends list, achievements, cloud saves, and chat via Valve's online service on Sony's console.
Portal 2 is a first-person puzzler game from Valve Software that draws from the original formula of innovative gameplay, story, and music, which earned the original Portal more than 70 industry accolades.

Portal 2 - GameSpot

Portal 2 Graphics Comparison - GameSpot

Portal 2 Review - GameSpot

Steam for PS3 Portal 2 detailed - GameSpot

The 40 most anticipated games of 2011 (photos) - CNET

Portal 2 Graphics Comparison - GameSpot

Portal (video game) - Wikipedia

Portal 2, Steamworks PS3-bound in 2011 - GameSpot

Portal 2 Co-Op Hands-On - GameSpot

Portal has sold nearly 4m, Steam sales not included

Portal 2 Review - GameSpot