Not yet but got it on my maybe list. I did pick up a couple older games to play on my new OC3D rig when I get it.
Picked up Crysis Warhead, and Splinter Cell Conviction. Have a copy of Portal 2 on the way. Also won a steam copy of Metro 2033 the other day on another site. So have that waiting to go as well.
I have been looking at the brink developer videos and looks like the game is going to have a lot of cool new stuff like more realistic movement abilities such as being able to climb over and slide under stuff like tables and walls. They mentioned how in many games there will be a tall table but you try to crawl under and get the invisible wall, or how you are supposed to be a super soldier but can not climb over a 4 foot wall because the game developer did not code that in.
They said brink is supposed to fix this kind of stuff. Along with seamless single player to multiplayer gameplay. Not sure how that works. Will have to wait till its out and you guys give some real world reviews.