I've been having fun with my Viewpad's GPS running Google's My Tracks application. Today I started tracking my bike ride to work, as I've done several times. When I arrived I saved the track as a KML file which can be imported into Google Earth for detailed viewing.
My 12km ride from Bottle Lake to University
It is surprisingly accurate; this morning as I crossed the railway line in Glandovey Rd I noticed a bike tail-light lying at the side of the road, so I turned back and picked it up. (It was broken, I later discovered.) Here's the evidence; the GPS logs my position every 2secs or so, which is why my path seems to be a series of straight lines at this level of detail.
Cyclist turns round to pick up something from the roadside.