A story about changing 'primary' monitors
I'm sitting pretty with a 27" iMac and a 30" Dell. Despite the Dell's higher resolution, the superiority of the much-newer IPS (LED et all) iMac keeps it as my primary screen - which means my dock and menubar on the top are on the iMac (esp since I video conference a lot and the camera is there, too).
So when I was early in my OS X days, I struggled in the menus to figure out how to 'move the clock' (or menubar, more accurately) from my 12" PowerBook to larger external LCD. It simply wasn't there in display preferences, or anywhere else! My ingrained Windows conditioning told me to keep searching submenus and eventually I'd find it.
Finally I exhaled and took a step back. 'What's the most Apple-easy way to accomplish this?' I asked myself. I grabbed the menubar in the 'Arrangement' tab of Display Preferences with my mouse and dragged it over the the other screen. Voila! Elegant and brilliant. From then on, despite the crappiness of G4 architecture, there was no going back.