Has anyone used the Apple iphone with any of the bicycle tracking applications? For example, Imapmyride is a free application that uses the iphone gps to provide "real time tracking with distance, time, pace, and speed display" and lets you view your training history with maps. Other applications, such as cychosis, are also out there.

I like the idea of being able to move from bicycle to bicycle easily and track my mileage seamlessly. The phone is tempting, but I want some feedback first, if possible.