Dan over at Sparrow Digital - a fellow Guild-er and colleague of mine was working on the LakesMTB website and required a way to embed GPX route maps so people could see and interact with the route on a map.

I was working on my own project - Trailblazer - at the time, and i adapted some of my work to include an embeddable iFrame-based 'widget' that includes a map (powered by openstreetmap), and elevation data.