NIB4J is an app to use interface builder to layout your Java apps. A site I’ve not read, but has articles on Cocoa is called StepWise. How about a graphing/plotting library? Cocoa/Perl? CamelBones. Cocoa/Python? PyObjC. A replacement splitview for cocoa apps. CocoaDevFaq might be a little outdated. Wanna write a game? Unity is a game dev environment. Cool looking. And Apple has a lot of new sample code on their dev site.