I made a thread about it a while back.
My mom and I do them. We've made over $10,000 in cash and prizes.
They do work, you just gotta read the fine print.
We've gotten iPods, Razrs, 2 Plasma TV's, and tons of other small things and lots of checks and gift cards.
Look for the thread... it may be in the old forum (which is still usable).