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Try this one, either on the stairs as per John's suggestion, or on a calf press machine if you're feeling really masochistic.

(I've worked out with a guy who does these bent over with 3 guys on his back!!)

Start with your feet as low as possible without slipping off the edge. Raise your heels up one third of the way, and then back down for 15-20 reps (or more). Next start from the 1/3 up point, and this time move from there to the 2/3 point for the same number of reps. Next start from the 2/3 point and move to the highest you can go, again for the same number of reps. Once you've done that, this time go through your full range of motion for the same number of reps.

You should get a good burn after that workout!

Make sure you warm up before and stretch well before during and after.

Ideally you should do it as part of a total body workout to avoid your muscles developing out of balance, which can cause you a lot of problems in the future.

Hamish