iSuppli reports that iPhone/iPod integration will hit 58 percent next year, up from 39 percent in 2008 So, for the first time, the majority of all cars sold in this country will be ready to dock with Apple's massively popular smartphone and music player. The reason: Simple supply and demand. iSuppli writes:

U.S. consumers for the past few years have been demanding improved connectivity between their vehicles’ audio/video systems and their Portable Media Players (PMPs), particularly iPods. Automakers have responded to that demand in a big way...

To support a broader range of portable music players and and devices, Automakers will offer USB interface options in 33 percent of cars in 2009, more than double this year's percentage.

Bluetooth wireless connectivity will become either standard or an option in 82 percent of cars next year, up from 55 percent this year.