MDA: That's a great link! Thanks, it helped me think of some new things to try.
WIP: Your calves in my opinion are the hardest muscle group to grow because you use them every step of the day. They are extremely dense muscles and even when you work them out so hard that they burn like mad (and of course you do another 10 repetitions after that

), you are probably able to walk fine just 15 minutes later. I mean they are really really difficult to grow in a large number of people, so that's why you need to really shock them and give them a lot of weight for a lot of repetitions.
Regarding your leg squat workout, have you tried front squats? You won't be able to use as much weight, but they are just fantastic. Also hindu squats with your own bodyweight will keep your heart elevated and work on your legs endurance. My training partner and I do 10 in-between sets (while my partner lifts) and then I rest and wait for my turn. Good luck and I hope you reach your goals in 2005!