I've been tinkering more with Xcode and Cocoa, working on making a utility to help people write casebooks for Arkham Investigations. Here's a screenie of progress so far:
(Click to enlarge)
Not all the controls you see here work yet, but it is letting you click back and forth between the table on the left and paragraphs on the right to edit. You can also shift-click on the table to automatically add a paragraph reference to the clicked-on paragraph to the currently-edited paragraph, something that took me quite a bit of reading to figure out how to do (and I'm pretty sure there are better ways to do it, but I'm just not familiar with the framework yet).