This application uses topological maps and your GPS to help you navigate and locate where you are and where you're going. Great if you're a hiker, climber or fisherman/boater/sailer.
I tested it this morning while walking the Irish Wolfhound and it is "spot-on" location-wise. We have a large reservoir/wildlife preserve near us and it shows a lot of details.
The only negative that I found was that panoramic views of the USA are not available yet (I guess we're just too big of a country!).
On 22-Oct-09 falconer said that this was one of his most-used apps. His post title was about Skype, so many people probably didn't read the bit about Viewranger.
Here is the link to download for evaluation:
http://www.viewranger.com/softwareupdate.htm
This app goes on my list of ones worth purchasing.