I just found something cool on my MacBook Pro by accident. You can switch the order of the menu bar items on the right (clock, battery power, airport, etc) by turning them off and then turning them back on in the order you want in the System Preferences. The first thing you turn on is at the far right, the second is just to the left, the third is to the left of that, and so on.This becomes even more helpful if you have your menu bar littered with stuff they way that I do.
I love iStat Menus which tells me all sorts of stuff about my computer while I am using it like the internal temperature, how much memory is being used, and what processes my computer is working on and how much data is being uploaded and downloaded.
By turning them all off and then turning them on in the order you want, you can customize your menu bar... and I figured this out by accident.
