After my first baby I lost the weight (a year later) by drinking slim fast twice a day. I did that for about a month, lost 20 pounds. The next two months I was so used to eating less that I lost an other 20 pounds. Now though, I'm super allergic to non nutritive sweeteners, so no more slim fast for me.
I did like the meal replacement shake though because it was a way for me to eat less without having to measure out portions myself. Once the shake was gone, the meal was done, no more 'one more bite.'
This time I found a meal replacement shake (powder form) and I'm going to start slow in January. One shake a day to replace lunch or dinner. I will exercise 3 times a week, starting slow. I'll probably be going on walks with the kids. My goal is 1.5-2 pounds a week to make my goal of 30 pounds liter for my 30th birthday.