[Video archived] Ted Florence provides a demonstration of the PDF Maps app for iPad. He compares a basic looking Google map of Algonquin Park to a very detailed map of the park which is available on the Avenza Map Store. Combined with using the built-in GPS, it provides a great offline navigation solution.
In addition to showing off the map, Mr. Florence loads a TTC map of Toronto and imports waypoints shared through email. This feature allows for collaboration between people who use the same maps. Importing and exporting waypoints can also be done through Dropbox or iTunes, as demonstrated here. Look for more sharing options in future releases.
PDF Maps is available on the App Store.