I am based in the UK started developing PHP apps using Mojavi 3 (DEV) for about a year ago. My largest project based upon Agavi is a wi-fi hotspots directory called Total Hotspots.
You can usually find me on #agavi, although most of the time I am idling. The lead Agavi developers have a much deeper understanding of Agavi under the bonnet, however I know my way around the source code and like to contribute ideas, bug fixes and participate in debate over crucial design decisions.