Hey Flood. Just thought I'd share with y'all that Red Orchestra 2 is free on Steam today, and only today. If you start downloading it today, it is a permanent fixture on your account; it's not enough to just claim it, you have to start the download, too.
Since people have been asking me, I think if you pause the download you can pick it up tomorrow, but don't quote me on it. To be safe, just download the whole game today.
EDIT: Another question people have been asking is if you have to download all four parts of the game today. The answer is probably no, because they're all the same "game" to Steam, just with four different executables. So downloading any one part should "claim" everything for your account. Remember, though, I'm only downloading it for the first time myself! I'd still recommend to download as many parts as you can, just to be safe, but if you have a bandwidth cap or something, just download either the singleplayer or the multiplayer and do the rest some other day.