In the midst of my Los Angeles project, I have looked hither and yon for a map that will tell me everything I want it to: where are the various cities? and where are the geological features? and what about the rivers, streams, and canyons? Well, look no further: you use the Map Locator to get the general area, then you pinpoint markers, which allow you to see the relevant maps, and then you download the maps as pdf files. And then, you screen grab 'em and post 'em to your blog:
And free! The coolest maps ever, and they are free!