3d Bots

Can I have some resources on 3d NPC programming? I mean the kinds you get in current-generation FPSs, the ones that run, crouch, and do other scripted animations while simulataneously responding to external stimulus and interact with the physics engine. Basically, I'd like information on making good quality, smoothly animated 3d bots.

Articles, tutorials, anecdotes, libraries, source code, engines, whatever. Some relevant search terms to put into google would be good too.