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I use Mapcard.com for most of my non-paper map tech. It's produced by the USGS (United States Geological Survey).
Like the other maps you can load into your computer and view from any where you take your PC, Mapcard will for $19.95 a year allow you to see anyplace in the USA, including Alaska and Hawaii. It covers the scale from 1/6000 to 1/1,000,000 depending on the area. You can also get color and/or black & white Aerial photos in all the scales. Plus with Java you can draw lines, get GPS cordinates,place flags,map distances, Etc.
And print out or save to your hard-drive all the maps you want for the yearly membership. Or save to the website any maps for future viewing and download. I like it cause I can print the area of the place I am going without having the huge 7.5 or 15 minute map with maybe 80% of what is not on my trail or route.
You can also get larger scale images of where-ever (USA) by clicking on the USA map in the lower right corner and zoom in to increase scale. Otherwise you simply type in the placename, state and Go. If you don't type the state it will bring up every available topomap with the placename given. Check it out at www.mapcard.com
I have used it for about 3 years now and really like it.
And if you want to order the paper maps go to http://topographicalmaps.com/ There you can see and order any topographic map in the USA, by state and location in that state.