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U.S. Geological Survey – National Mapping Information
The first place to look for topo maps and a variety of other mapping and imaging products.

Long known for its excellent series of state atlases, DeLorme now offers a range of digital products: StreetAtlas, Topo USA, satellite imagery, GPS-integrated maps, and 3-D topo quads on disk.

Raven Maps
Raven limits itself to maps of states, but these are large and works of art. Delicate tinting indicates elevation, while shading gives the illusion of 3-dimensional relief.

Northern Cartographic
Map makers and a good source of outdoors maps and trail guides.

Backpacker Magazine Map Store
Source of topo maps for the country. See their series of 1:35,000 waterproof topos in shaded relief.
Offers a great variety of maps for almost any point on the globe.

Omni Resources Map Catalog
“The World’s Largest Online Map Catalog.”Order satellite images, paper maps, digital maps, 3-D maps, and mapping software for almost any place on the planet.

Digital topo maps, marine charts, and GPS navigational software.
Offers a variety of mapping products. Backpacker magazine gave a good review to OffRoute’s customized topos with shading to emphasize terrain. You select the area, map size, and material; and OffRoute ships the map to you.
Mytopo will print you a customized topo map of any area you specify and mail it to you.
An online source of interactive topo maps of the entire United States. Will create a paper map of any area you choose.

Garmin MapSource
MapSource digital TOPO CD-ROM maps are similar to USGS 1:100,000-scale topographic paper maps and allow you to transfer waypoints, routes, and tracks between your PC and many GPS units.

Inner Source Log Tracking
Upload GPS track logs and overlay those tracks onto aerial photos and topographic maps. A number of GPS track formats are supported.

Google Maps
Unusual in its speed and ability to move across an infinitely large map by clicking and dragging the mouse.More suitable for driving than for navigation.

View USGS topo maps free online. Coverage for 27 states (mostly western). Will customize paper maps in several sizes and formats.

National Geographic TOPO! Interactive maps.
Digital topo maps for every state are integrated with GPS software.
A commercial, by-subscription service which provides worldwide aerial photographs and satellite images that you can view online or purchase. Limited New England coverage, but still fascinating.

Microsoft terraserver
View remote images of any area in the USA; see your home from space. Fun and interesting.

Commercial Terrain Visualization Software
The Army Corps of Engineers surveys hundreds of products which can create three-dimensional terrain models: flight simulation, GIS, rendering, scientific visualization, and animation software.

UTM Grid Overlay
Print this page with 9 UTM grids, copy it onto transparency stock, and cut out the individual grids. For 1:24000 scale only.

Transparent Map Overlay Ruler
Print or copy this page onto transparency stock, and you’ll have a handy-dandy 100-meter UTM grid, slope indicator, latitude/longitude scale, and a tenths rule. For 1:24000 scale.