I've been thinking about this as well. I gained 30 pounds with this pregnancy and 20 came off in the first couple of weeks. The last 10 are NOT budging, though--it may not sound like much, but I'm a small person, and 10 pounds makes a huge difference on my body. Even some of my looser clothes--elastic waist skirts, for instance--are fitting way too snugly. As for the jeans and stuff, forget it. As someone said elsewhere, my body just seems to be shaped differently than it was before.
I'm looking forward to fall, when I can REALLY go on some long walks with the bun. This 90-degrees-and-humid stuff just isn't cutting it.