Until recently, bringing the Internet to the car has been an issue due primarily to the fact that few manufacturers wanted to go to the expense of adding a wireless communications module to the vehicle, particularly one likely to be obsolete in the lifetime of the car.
You can also use the same slot to expand the device's capabilities--already Palm has developed a Bluetooth wirelessmodule that fits into the SD card slot.
Luma, meanwhile, offers up wireless adjustments to the device's intense flashlight module, letting you cycle through patterns as well as brighten and dim.