Excel has handy keyboard shortcuts for everything from bulleted lists to text wrapping. The official Excel blog offers up PDF cheat sheets for the most common shortcuts, sorted into Control-triggered shortcuts, function keys and other oddities.
We've featured a similar and more comprehensive guide before, but the cheat sheets are a useful reference for the most common functions. What's your most-used Excel shortcut? Tell us in the comments. (For me, F2 to edit the current cell probably wins, followed by Ctrl-1 to format cells.)