Ryu:
I'm sure you already know bridges and upright rows, but those have got to be the best. Upright rows gave me a "weightlifter's neck" within a few months. Now I am a massage therapist's wet dream - a mass of knots in my upper back and neck.
The right kind of pull-ups, i.e. wide-grip, can also be helpful in developing a big neck, if that's what you're going for.
Personally, if I kept doing those, my head would disappear before long.
