There is an app for that?

All these days I've been thinking of writing a location-aware app that would tell me about interesting sights & news-worthy facts about places that fall in the way of a train journey.

It turns out @codepo8 already has a sample app  on something similar WITH source [zip file] that I can adapt.

There are also a host of other demos of the Geolocation API, with source, on the Mozilla Demo Studio site.

Related links:
12 Cool HTML5 Geolocation Ideas
MSDN: How to Create a Location-Aware Webpage