In true tech fashion, the PHP-GTK Community Site is offering a new feature for the users (and viewers) of their site - a geolocation web service that helps you see locations of other site members.
The site offers "geo-nick", a simplistic API to obtain this [latitude and longitude] information coupled with the optional IRC nick field, to allow any developer to create mashups showing community PHP-GTK developers, as identified by nickname (no actual name information is made available through this API) on a map.
The post includes an example of how to use the API - what package to call and what the message should contain. The results are passed back in an array of nickname, lataitude, longitude.
Piggybacking on this new service, they also have a new tutorial showing how to access and use this service from a simple PHP-GTK2 application. It just grabs the results and dumps them into a simple text area in a window.