I have a very long history with the Mac. I started writing for the Mac about 1987 or 1988. My first big project was a bit of shareware called "DoppleMaker". DoppleMaker was a license metering software system. What DoppleMaker would do is hide the original application by making it invisible and by mangling its creator and type. Then it would create a small application with the same icon as the original - a doppleganger for the original application. When the doppleganger was launched, it would find the orignal and force it to run.
While most of my development efforts are web based, I'm still excited to take on Mac OS X development. Our Mac OS X experience includes Cocoa, Objective-C, Core Data, Quartz, QuickTime, and OpenGL.
Here are a few projects or samples I can share with you.