MDM
Hasn't posted much yet...
I thought the 2009 Tech package models all included 1-year of XM. I believe they've dropped this to 3 months for 2010 though.
Although the window sticker says it is a 3 month trial, the Data System Quick Start Guide still says 12 month free trial if you have the Tech Package. My salesman also had said it was a 12 month trial.
When I was back at the dealership one month after purchase (rebadging), I broached this with another salesman (mine was off that day) and he called XM on my behalf. It helped that I had the XM renewal letter with me. Due to the information in the Quick Start Guide, XM extended my coverage for an additional 12 months, so 13 in all.
May work for you.