I participate in Zoom Rewards - nothing miles related - but quick two minute surveys about once a week for low-cost items in return. I've gotten a free juicer & a flexible mini-tripod in the past year (value = about 35 bucks total) and am working towards a device that will let me use my portable DVD players' MP3 function and listen to it over an FM frequency - finally - an MP3 player for the car...

Good idea for a thread, JFE!