Time for a statement about used GPS devices.
My focus is logging hiking tracks.
Using my Iphone 3GS was satisfying, except the poor running time. Logging GPS-Data at with the Everytrail-App isn´t possible longer then 3 hours! Anything else, means logging, taking pictures and load them up, edit trips and load them up is comfortable and nearly perfect, but I am tired of bearing an additional charging device including batteries with me. So I decided to use a GPS mouse which is able to save my trips and allows me to read out logfiles after finishing my daily trips or, due to the storage capacity, of the whole trip. So I use a WINTEC G-Rays 2. This device runs more then 8 hours and is able to log more then 300 000 trackpoints. Charging with USB needs around one hour. The software to read data logs is TimemachineX.