First of all, welcome to the forum. Nice truck!
I had looked around for iPod integration when I first bought my Frontier around the June/July time frame, and there wasn't anything available. However, my latest search on crutchfield.com came back with an option that is coming out on 10/10!!!!!
http://www.crutchfield.com/S-0k9oMNF...g=227450&avf=Y
I did a search for my CC with the 10 speaker RF package, and this came up, but I just plugged in the extended cab with the 4 speaker system, and it looks like they are advertising this as a solution for any 2005 Frontier.
It does say basically that it either uses the "internal FM modulator", which I'm assuming is an FM transmitter, or an auxilary input connection. By the way, anyone know if our stereos have an aux input? (I have the crew cab with the 10 speaker RF package.)
Enjoy!!!