Steam, by Valve, the alternative to Impulse.
Speaking of which, you can take your AI War key that you bought in Impulse and register it with Steam too.
Yes, thank you. I know what steam is. I don't know what he meant by 'make an announcement' or 'ask around on steam'. Ask whom? Where?
For anyone that might not know there's a Dwarf Fortress Community on Steam. Just click on Community when you start up steam and do a search for the DFC. It should pop right up and you can join there then make announcements/post comments/etc. There's quite a lot of Team Fortress 2 going on there, but there's also a bunch of other games. It seems like people can pretty much just mention something and at least a few other people will play.
Edit: Also, downloading the demo. Looks like a lot of fun from what I've read.