I am doing something similar to you. I have done Weight Watchers and South Beach in the past, with good success. I am using this site to count my calories, and I am really watching what I'm eating. I've tried to make good choices, and keep my portions small. I've also been exercising every day, either riding my bike (toddler trailer in tow!) or watching exercise videos from OnDemand. I'm only a few days in, but I feel good about it.
34 years old
Starting weight- 200 lbs 7/17/10 (joined FitDay)
Current weight- 196 lbs (-4) 7/31/10
Mini-goal- 180 lbs by 10/17/10
Final goal- 140 lbs by 7/17/11