lat/long is quite common in geocaching. geocaching.com has lots of examples. Here's the page for one of the caches I created: http://www.geocaching.com/seek/cache_details.aspx?guid=dc4754bf-64d5-4f28-8715-45ad2505c86f There are discussion forums and blogs on geocaching. We're lat/long nerds. I haven't seen any common markup for them yet. Chris -- Chris Hibbert Principal Investigator, Prediction Markets chris.hibbert at commerce.net http://zocalo.sourceforge.net/