Yeah, they did a damn good job with that.
Speaking of Source stuff...If you have Garry's Mod, you NEED to check out Sassilization.com's "deathrun" mode.
http://www.youtube.com/watch?v=wjOJxK1fsT0(The big red ERROR hat is not supposed to be there...the guy playing is missing some game assets and the red error is a placeholder.)
Humans vs Deaths. 4 people play as Death, and operate the traps in the level. Everyone else plays runners and tries to make it through the level alive. At the end (assuming runners make it) there's always some sort of showdown between the two sides, often involving guns. There's also a persistent account-based money system to buy rewards with (hats, trails, new models, etc.).
I actually ran into someone who must have been from NICO on Deathrun yesterday. Asked me if I drive an Infiniti.