Here's one that may have been around awhile, but I just became aware of today - Google Bicycle Maps. Under the "More" pulldown in the upper right of a Google map is a Bicycling option! There is also the ability to "Get Directions" for bicycle travelers. Now, is that neat or what?
This is not complete, as apparently Google thinks everyone in backwaters like Albert Lea drive cars. Or maybe boats, from this photo link on the Google map. It's kind of eerie, looking to see if you can make out your own home on photos posted to the world. At least the trees protect me from Google Earth, so people can't peek in my windows.