Here's a real (non-commercial) vote for SPANX underwear. Buddha_Girl is going to postpone her tummy tuck now that she's wearing SPANX. She says,

"I put Buddha to bed a little while ago and immediately tore into the package! I'm sitting in my little pair of Spanx as we speak...and cannot believe that something so small looking is actually on my body. I'm grinning from ear to ear. There's no way I'm getting my tummy tuck this summer. I'm waiting until next summer when Buddha's walking and much more independent. I'd never be able to take care of him this summer AND recover from surgery.

In the name of no tummy tuck, I'm officially a Spanx wearer. I simply cannot believe how much thinner I look and feel in these things. I'm shocked. Honest."