uXM for the iPhone

Here's an app that I am hoping will be ported to the App Store. uXM is, well, XM on your iPhone. This peaks my interest because, as you can probably guess, I have an XM account. Do I use it? No, not really, cause it's actually my mom's, and the XM receivers are kinda expensive for me, and frankly I'm sick and tired of CDs in my car. So, once I get my iPhone 3G, my options will be:

A. Mod my head unit and make an Auxiliary jack for it

or

B. Get an FM transmitter

Although A sounds cooler and stuff, I'm probably going to be taking the easy way out and buying an FM transmitter. 

So: I want uXM on my iPhone 3G without Jailbreaking it. Because, frankly, I'm done with listening to CDs and I've been done with the radio for a good long time now, and I'm never going to pick it back up. The only things I want to listen to are either Mp3s or XM, and what a better way to combine the things I want to hear!