Omgzors Dynamic Water!
http://www.garrysmod.com/news/?p=7601 (http://www.garrysmod.com/news/?p=7601)
Yeah, its nice and everything, I had fun with it, but it can't extingunish fires :/ And it has a few other bugs, I hope they'll be fixed happyface.
Cool, would be killer on your comp if you had a real working perfectly one.