i use Google Earth to plan my routes. haven't done any touring yet but i can't imagine it being much more difficult to find the right roads. you can see almost everything on there. road width, it even has a little ruler to measure the distance between towns, and many people upload photos to a website called Panoramio, which lets it's users pin their pictures to the spot where they were taken in Google Earth

so you get a general idea of what landscape you'll be riding through. it's helped me discover some really good roads near my hometown.

oh yeah you can see hills on it too

i overlooked that once, went out on the ride and found myself at the bottom of a HUGE hill