You have to do crunches, girl!! Work up to 300 per day- or more. Don't forget about your obliques (the side muscles). I never knew there were muscles there! tee hee hee!
I lost more than 33 lbs after the birth of dc2 and my pooch (as I call it) is still there, unfortunately. I don't think it's going anywhere any time soon. I worked with a trainer for 3 months and she told me that you have to work all the muscles and not do 'spot training'. My weight left my legs first, then my arms, then face and LAST was my hips and tummy.
Also, read the thread about the south beach diet vs. weight watchers. You do have to change your eating as part of a lifestyle change -we're not getting any younger, are we???