This is the most recent outcome of my PhD research: a Layar layer that allows you to visualise dynamic geoRSS feeds with no effort or set-up at all. Just provide the geoRSS feed URL. Here’s an overview:

The geoRSS Layar Gateway – An overview from Josh Harle on Vimeo.

There is an example geoRSS feed that you can base your own on.

It is possible to create links that – when viewed on your iPhone – will automatically open Layar, the geoRSS gateway, and your geoRSS feed, using the following format:

layar://georssgateway?CHECKBOXLIST=1&SEARCHBOX=the tinyURL version of your feed

Please use the comments section to report any bugs or suggestions.