Battlefield:  Bad Company 2 is available for preorder now.  If you preorder the game then you get access to the currently running beta which is available for the next month or so.  It’s only one map and one gameplay type but it really gives you a feel for the mechanics of game.  There are a few of us playing the beta now so if you want to join us make a post in the Battlefield forum.

The game appears to be very tough and it will definitely take some very coordinated teamwork to be able to win consistently.