Hi there, Red Orchestra's website is here...
http://www.redorchestragame.com/
It used to be a download mod for one of the UT games but now it's a standalone product that is available in all good PC games shops or online at places like Play.com or Amazon. Give it a go it's fab, you even have to swap barrels on the MG34 after heavy firefights. :smoke:
*Edit*
Just saw your email, you could also look at games like Call Of Duty...
http://www.callofduty.com/
and also Brothers In Arms...
http://www.brothersinarmsgame.com/us/index.php
Both games are excellent games but i think COD has the larger online community. BIA is more tactical as you have to also order two fire teams about the battlefield, where as COD is more of a twitchers game.
Hope this helps.