| Mr. D.
Sets of 40 pullups is great. You must either have great upper body strength and endurance an/or be fairly light. Being nearly 200 lb, I struggle to do a set of ten. You will find that pull-ups on their own, while a compound movement are rather limiting. There are some things you can do to make them progressive, but for more effective strength training you should broaden out the types of exercise you do. If you are interested, I can provide some suggestions. As to the pullups, your regime is no longer strength training, but endurance. Add weight, probably 25lbs in a backpack or with a dip belt. When you can get 10-12 reps, add some more weight. If you can't get 4-6 reps, drop the weight. Do 3 sets.
Jumping rope is fine as cardio. It probably does little to strengthen bones. Strength training with heavy weigh strengthen bones, but pullups probably do little. Lift a couple hundred pounds on your back, and your bones will get strong. You could also get an indoor bike (they make wind trainers for regular bikes). It is more difficult to increase the difficulty with jumping rope, but it can give you a good workout.
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...brian
T2 since 7/05. 48 yrs. 5'11 195 lbs.
Exercise, very low carb diet
HbA1c 9/07 - 6.3%, 3/08 - 6.2%, 6/08 - 6.2% | 
Make sure to get a rope the right length for you. I like my Everlast one with wooden handles and leather rope. 
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