A bit of belated news, we've recently released one of our first endeavors into the realm of open source Mac development, Bonsoir. Bonsoir is released under the very liberal BarCamp License, as I wrote it for BarCampTexas. The project itself is in a very infantile stage, and does need a decent amount of work (and an icon!), but it fulfilled its main purpose, which was to demonstrate to the BarCampers, who were mostly web developers, the benefits of developing with the Cocoa API in both functionality, and rapid application development. (Note: Bonsoir was also featured on the unofficial apple weblog (TUAW))

Bonsoir now lives in its own little part of our open source wiki and can be found on the Bonsoir page. Bonsoir itself, is a relatively simple program that functions both as a client and a server, allowed conference attendees to share their public vCards (Address Book cards) over the local-area network via Bonjour service discovery. Most of the code is still a bit rough around the edges as Todd Manning pointed out. I personally hope you find the source educational if nothing else, and feel free to send me patches! (tyler@bleepsoft.com)