Q: What exercises (other than running) do you recommend for building as much muscle in the calves as possible?

A: Calves are the one muscle for which cardio exercises (running, etc.) may build the muscle even better than weight training. But as far as weight training, you should do calf raises of all sorts. Your gym should have machines for standing and sitting calf raises where you can adjust the weight. I have one of these listed on my Essential Exercises page. Finally you can try to walk on your toes around the house as much as possible -- it really works. Just have patience, for some people calves can be very difficult to build up while others gain them quickly.