I'm surprised that the author replaced iTunes with Pandora when Grooveshark is so much more versatile. Plus, it can be made into a damn good Fluid app. Additionally, some of his "replacements" are just extensions to normal processes; Hyperspaces runs within spaces, and Witch runs within Expose. On that note, though, there's a QuickTime add-on called Perian that makes the program much more versatile, and can in many cases re-replace VLC.