I’ve just added some code to my public subversion repository. Firstly a bunch of [project and file templates[2] I use with XCode. the CocoaApp Project template turns on a lot of useful compiler options that you should be using these days (including GNU C99 support and new style Objective-C exception). It also adds a build script that produces a bzip2 tarball of the application when built under with a “Release” build configuration. The “Category”, “Nibfile” and “plist” file templates also come in very useful.
The second thing is my “ToxicSQL” framework. You guess it – another Objective-C wrapper around sqlite. This one is actually quite mature and has been QA-ed as part of a commercial application.