Oooo... I didn't know about any special attacks.
Can you learn to kick people in the nads?
Still surprised that the groin isn't a selectable target in VATS. Probably would need a complete code re-write for it... That or it wouldn't get passed the stupid censors. [censored] Censorship. <- Especially that one.
Well, the 9-iron has the option of hitting people in the groin, and I believe other melee weapons get their own special attacks as well.
Unarmed, leveled by itself, provides Uppercut (a normal VATS attack that aims for the head) and Cross (a direct punch that knocks people back and very often drops their weapon).
Ranger Takedown is taught in Novac, but I believe it's not a VATS move (it otherwise requires a backwards power attack).