The beauty of Mac OS X/Cocoa
Will MacOS X be all that? Through this windy road Apple's led us through since acquiring NeXT - one of the early advantages of the NeXT OS I remember hearing about was that it was a programmer's dream-environment.
Stepwise covers an Intro session to Cocoa:
"Becky challenged Mike Ferris to create a version of SimpleText in less than 50 lines. Mike was easily able to accomplish this using the NSDocument classes. With the templates that were created by ProjectBuilder, the number of actual lines that had to be added/edited numbered under ten."