Valve releases Alien Swarm, a free Source top-down co-op shooter, on Monday

I checked out the forums and was glad to see I wasn't the only one who really wants a DoTA Mod based on this. I'll definitely be downloading this.

I really like what Valve is doing with Steam lately. They're in a big battle with that other game studio (Activision of course), and Alien Swarm looks like pretty good ammo. A pity there's no mac version. Yeah, I know, there's bootcamp.

It's not just free - they're also releasing the source!!!

This reminds me of Natural Selection, which has to have been one of the most interesting Half-Life mods I use to play.<p><a href="http://www.unknownworlds.com/ns/" rel="nofollow">http://www.unknownworlds.com/ns/</a>

I have pretty high expectations after playing the UT 2004 version years back.