I was afraid of that.
You're going to have to decide if the iPod is worth redoing your system. If so, buy both the GM XM Kit and the new Axxess iPOD Interface #GMIP-01.
Of course, you could buy a Pioneer NAV unit and connect your 910XM tuner to it.
http://www.pioneerelectronics.com/pna/press/release/det...13_191756407,00.html
http://www.crutchfield.com/S-GBG57us31sZ/cgi-bin/ProdVi...00&search=CD%2DIB100
http://www.crutchfield.com/S-GBG57us31sZ/cgi-bin/ProdVi...g=182350&I=130AVICD1