Anyone with any game that gives you the Source SDK on steam should check out this awesome FPS mod. http://www.neotokyohq.com/ Its based of the tv show "Ghost in The Shell" and has some great gameplay considering its a mod still in beta.
Yeah I play Neotokyo a bit, it's pretty fun and definitely one of the harder FPS games I've played, I still prefer CS:S though.
It looks like it has some potential, I may look into it if I ever end up getting the Source SDK on steam.