This has to be the coolest thing I've seen. XM radio can provide hours of listening enjoyment for the long road trip. Now, reams of live weather data and maps are available over XM satellite radio! Who could've imagined? The FAA has even approved it for aviation use. The downside? It's mo-expensive. Yes, it's not only $1600+ for XM and GPS receivers, it's also $100 per month for the actual service.
Nonetheless, check it out!