Blotter / Core Data
Wow, core data is shiny. James re-wrote (the core of) Blotter in 10 minutes using it, so after a bit of polish, I have a 0.9 release, written in pure ObjC/Core Data. Alas, you need 10.4 to run it, and XCode 2.1 to build it (an 800 meg download! ow) but that's the cutting-edge future for you. Sigh.