Trails App for iPhone
This is a neat little app for iOS, that uses location service and references it against publicly available geographic data (think terrain, altitude, etc). The end result is a nifty little piece of software let's you track your trails and mileage on the go. I'm curious about how well it holds up in other people's experience.
As with most technology, "what starts as recreational, often becomes typical". I look forward to hearing some testimonies.