So how's mine going you may wonder. Not too bad so far. I've lost 40lbs and only have 25lbs to go to get to my pre-baby weight. It going so well though I've made a goal to lose another 19lbs after that. What's working the best is counting my calories, I just keep what I eat to under 2,200 a day. I figure if nursing burns 500 calories a day and I am also working out for an hour burning another 300-500 then I'm well below what I should be taking in. So far I've been loosing about 3lbs a week since I started it which is as much as I want to, it's a healthy amount and puts me back to my regular weight in about 10 weeks and then another 5 to my goal. If I don't make it that fast too it's ok so my end goal is just to be down to 130lbs by the time my son turns 1. That gives me another 6 1/2 months to get there.
Aside for that goal I've set smaller ones with my work outs that help out a lot too, like running 3 miles in 30mins. I haven't gotten there yet, but almost (3=33mins right now) and I've dropped two sizes since I had my son so that great too.
It's a lot of work, but I know the breastfeeding really helps get things moving in the right direction for which I am very glad, it's so much work us nursing moms deserve to burn a few extra calories!