The 2013 International CES in Las Vegas was a reminder just how much our cars have become a second home to us. Both Ford (NYSE:F) and General Motors (NYSE:GM) announced they are welcoming outside developers to create in-car apps for entertainment, communication, and navigation.

Ford's SYNC AppLink features voice control for many of its apps. The control panel for GM's Chevrolet MyLink looks like an Apple (NASDAQ:AAPL) iPhone, and many of its vehicles integrate directly with Apple's Siri voice control.

Another battle taking place inside your car is the one between satellite radio king Sirius XM (NASDAQ:SIRI) and web radio providers such as Pandora (NYSE:P). Rex Moore caught up with consumer technology expert Rob Pegoraro in Las Vegas and asked him who might win the ears of today's drivers.