As you know, if you've read my ipod port problem entry, my aux jack for my ipod is broken in my car. Before a weekend trip we just took to Nashville, Tn., I bought a Monster iCarPlay Plus wireless transmitter/charger so we could listen to my ipod in my husbands truck. And, of course, in my car. Well, I just want to report that it works GREAT! Even when I get my aux jack fixed in my car, I may prefer this method first. You can adjust the volume with your car stereo, you don't have to mess with the ipod volume at all. It's wireless, so you just plug in the power jack to the cig. lighter, and tune the radio, and the transmitter to the same chanel, and that's it. They sell in Best Buy for, I think, around $99. I bought mine on ebay and got it for $40 plus shipping. It was well worth the money.
