Made the switch to Mac OS X but have lots of experience on Windows? Our MacBook Migrant series covers what you need to know to ease the transition. Here's the complete set in one place for easy reference.
The motivation behind the series: not getting caught in a pseudo-religious argument about what's "better", but documenting where the differences are.
Easy keyboard access to Spotlight and app switching makes the changeover much easier.
If you prefer Windows-style window maximising, it's easier to make happen in Mac OS X than you might think.
There's several distinct approaches to app installation in Mac OS X; knowing them all is helpful!
How to get every delete option you want on any Mac keyboard.
File management with Finder is easier when you understand its approach.
Despite its emphasis on mouse (and touch) actions, you can speed up your work on a Mac with the right keyboard shortcuts.
Other stuff that's good to know when shifting from Windows to Mac.