DeLorme Topo for GPS Coordinates and GPS Data Management

Move your mouse over a location and display the GPS Coordinates. Collect GPS locations in the field or accumulate a track long and plot them atop of a map on your PC. Search for a point by typing in coordinates - the software will zoom right in. Take your PC/GPS into the field and do live tracking.
Only $39.90
DeLorme Topo - GPS Coordinates Software

The most GPS friendly software that I have used. Features every USGS topo map for an entire state at 1:24,000 scale and more. Upload/download, plot and import/export gps locations and tracks easily between computer and GPS. Read GPS coordinates on screen for any location where you place your mouse. Live tracking with your PC in the field.
Only $79.95
National Geographic Topo - GPS Compatible

MapCard Topo Maps and Aerial Photos with GPS Support

Unlimited online access to view, print, save and email as many topo maps and aerial photos as you want for anywhere in the United States for one full year. Included are easy-to-use tools that allow you to customize your maps and photos with text / symbols, estimate GPS coordinates, mark waypoints, estimate areas / distances and email maps to friends. Upload your GPS coordiates and plot them atop of your maps.
Only $19.95 per year
MapCard GPS Compatible Maps and Photos