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.

Rex Moore has no position in any stocks mentioned. The Motley Fool recommends Apple, Ford, and General Motors. The Motley Fool owns shares of Apple and Ford. Try any of our Foolish newsletter services free for 30 days. We Fools may not all hold the same opinions, but we all believe that considering a diverse range of insights makes us better investors. The Motley Fool has a disclosure policy.