@Raul: the best recommondation for travelling across the USA is the historic Route 66, much more stylish and interesting than the actual highways.
A bit tricky to find because the 66 doensn't existing any more, but it's possible.
http://www.amazon.de/Route-Stra%C3%9Fe-Sehnsucht-Holger-Hoetzel/dp/3550065582/ref=sr_1_26?ie=UTF8&s=books&qid=1214936424&sr=8-26