You can also do the calf lift (there are a few machines that accomplish that, such as one where you stand up, with weights somehow oriented on your shoulders and you stand on your toes then slowly let your heels down, and another that has you sitting with weights oriented on your knees where you do a similar motion). You can also do a hamstring lift (typically it is a machine that you lay down on and pull a bar, back towards your butt). also try reading through this site, has some good info on weight lifting
http://www.ridethetrack.com/pdf/train_rodamaker.pdf