N_C, I started biking about two and a half months ago. AT the time, I weighed 325 pounds. I have been watching what I eat, commuting to work and school, and trying to get in about 15 miles per day for the past month and a half. Since the middle of September, I have lost 64 pounds. I'm not going to say it was easy to start. Mny days, I was hurting so bad that the last thing I wanted to do was get back on my bike, but I did... every single day. Now, none of my clothes fit and everyone comes up to me to give me compliments on the amount of weight I've lost in this short time. I feel great, and while I'm not nearly on par with most of the guys on this board, I am an ecstatic that I can bike 25 or so miles at one time without hurting too bad (alhough a nice soak in the tub feels pretty good when I get home). Anyway, YOU CAN DO IT! I have tried every exercise program you can think of, and biking is what I can stick with. I love it!
Good Luck!