If cell phones, AM/FM/XM CD players, internet-based communications and digital satellite radio aren't enough, you may want to consider two other entertainment options for your car: mobile video systems that can play DVDs and MP3 players that provide several hours of music uploaded from your PC.

Most manufacturers offer factory-installed rear entertainment systems that play DVD movies to entertain passengers on long road trips. Small televisions, often connected to VCRs, have been offered in RVs, conversion vans and buses for years. But new mobile video systems are more sophisticated, offering flat screens that drop down from the headliner for viewing by backseat passengers, as well as wireless stereo headphones, integration with the vehicle's sound system and remote controls. SiriusXM even offers a Backseat TV subscription on some Chrysler, Dodge and Jeep models that features child-friendly programming. Some entertainment systems are integrated into the vehicle's navigation screen in the dash. Note that movies and other entertainment features usually won't play on front-seat screens unless the car is parked.

Built-in entertainment systems will cost you about $1,500 to $2,500, depending on the system and vehicle. Some are dual-screen systems that can simultaneously play different movies. Screen sizes and where the DVDs load (in-dash, headrest, or ceiling-mounted) vary by model. Aftermarket systems may be more expensive and may not interface well with the factory sound system, and they will not be covered by your vehicle warranty.

Manufacturers also offer MP3/iPod-compatible stereos as original equipment, generally in a CD/MP3 player combination and as a standard feature or as part of an option package. Integrated with navigation systems, displays now often control full “infotainment” systems that have built-in jukebox functionality and the ability to accept a variety of memory cars to expand storage capacity. In 2012, Chevrolet will begin rolling out its new MyLink system, which expands on the elements of OnStar, adding voice control capabilities to access the functionality provided by Pandora internet Radio, Gracenote, and Stitcher - referring to the new system as a “smartphone on wheels.”