A number of people wrote to whack on me for claiming the Tab key was related to the metal tabs on a mechanical typewriter, saying instead that it is short for "tabulator," a device for making tables. In that sense the key name still makes sense on the computer keyboard, although I wonder if people would have thought that before Word came up with its table feature. On systems with monospaced fonts (and even on Macs with proportional fonts), many people still use the space bar to make tables.
Create Multiple Inspectors in iWork
Tired of flipping between panes in the Inspector in Keynote, Pages, and Numbers? You can open multiple copies of the Inspector window with View > New Inspector, but even better, you can Option-click one of the icons at the top of the Inspector window to open that pane in a new Inspector.