Since I started churning around this time last year, Mrs. WonderMeal and I have gotten 10 free domestic plane tickets and will have 190k UR/120k US Air/40k SW points at the end of the month. Still haven't even touched United, BA, American, Amex, or hotel cards.
In that time, my credit score has increased by 38 points. (Prob due to my credit utilization or whatever it's called.)
Thanks, gE.