Many I knew, some I didn’t. But the author is right that it helps. The Tips & Tricks page has some nice notes as well.
I like to figure out the fastest way to do things. I hope these shortcuts will help you become the power user that lies within. These keystrokes should work on Mac OS 10.6 Snow Leopard and 10.5 Leopard (many also work on 10.4 Tiger). I add new shortcuts as I find them, so check back! I’m still exploring Snow Leopard and will be updating this page as I discover new goodies.