My personal FAVORITE! For all you US and Canadian residents who fly United Airlines, 250 miles per DAY:

https://www.avis.com/AvisWeb/html/pa.../index250.html

Provide coupon MUAA066 with your MP number at time of CHECKIN (important). Make sure they know that's a coupon number too. This expires 12/31/06.

I'm loving this one... been using it for a couple 2-week stints this year. In the words of Borat, "very nice!"