I saw an ad for this product in this week's USA Today Weekend; you're supposed to be able to just plug it into your phone, then set your radio to 88.7 FM, and it will transmit your call throught the speakers. If it works, it sounds like a good idea. Does anyone own one, or tried it?

http://jupiterjack.com/


The website sells it for $26.98 for one, but the ad I saw has it for $23.98 for two...