There are plenty of good map resources online - here are but a few. Just bear in mind that they can be slow when there are big images to download.
- Travel Notes has facilities for calculating the driving distance between cities.
- Clickherenow.com has maps and also driving directions for some locations.
- Travel Books - order online, whether guide books or atlases.
- Multimap, though currently just a British venture. Allows you to pinpoint specific addresses and postcodes.
- Streetmap Online, for the UK again.