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In 2008 an auxiliary jack was added to the single disc and six disc cd radios. This will allow playback from any device with a 3.5mm audio jack.
In 2010 a USB ( iPhone, iPod, thumb drive connectivity) along with an auxiliary jack was added to the navigation radio.
As far as aftermarket if you find a car you like that is not in the short list above), you need look no further than forum member Ray Kawal's interface for the GM PAL (Personal Audio Link) for your mp3 playback needs.
If you by a C6 with Nav you can easily convert the xm to an ipod connection with a cable sold by Ray kawal for about $35 bucks i believe. I hooked up mine in about 20 minutes. Good luck
Designer Imagines A Corvette That Looks More Like a Corvette Than the Corvette
Slideshow: A Jaguar designer's personal project imagines what a modern front-engined Corvette might look like if Chevrolet revisited the golden age of the Stingray.