Built-in storage is all the rage among carmakers and stereo manufacturers these days, and Kenwood is no exception. The vendor is using SEMA 2007 to show off its KDC-X991, which, in addition to its support for a range of digital-age audio formats (MP3, WMA, USB), comes with 512MB of internal flash memory--roughly enough for 30 albums' worth of music.
Drivers can rip CDs to the memory as they listen or import digital audio files via the stereo's USB port. A color fluorescent display and a novel jog dial controller let users navigate folders and files using an intuitive rotary menu. Kenwood's most capable stereo doesn't come cheap, though: expect to part with around $650 if you want to get your hands on one.