I too need to hook up my iPod to my new Crossfire. Here's what I'm going to try:

Click here
Edit - it's only $20.00!

Its good news that the iTrip works in the Crossfire, I've tried it in several cars and was not pleased at all with the results (that's my polite way of saying it sucked!).

I think for the long term I will install an FM Modulator like I did for my wife's Saab. Sound quality is almost CD like and there is no whine or hiss or white noise.