Don't like the way Safari looks or acts? Microsoft Internet Explorer got you down? If you're a Macintosh developer and have installed the latest SDK from Apple, you can write your own web browser with "one line of code" by following the instructions in this article from CocoaDevCentral.
Admittedly, the one-line browser is pretty useless for all practical purposes, but it does show the kind of power being placed in Macintosh developer's hands these days by Apple.
Debate all you will about the usefulness of Cocoa, but one thing that the folks at NeXT knew was that Objective-C (the language dialect that Cocoa uses) and the graphical design tools make it easy for consultants and programmers with limited experience to make custom applications to solve users problems.