quick

Fill forms quickly with the Tab key

Tab normally moves the cursor from one form field to another, while Shift Tab moves it back in reverse order.

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LaunchBar

Thumbnail image for LaunchBar

LaunchBar is a long-time favourite for quick access to files, documents, folders, URLs, Applescripts — anything at all on a Mac.

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Stickies

Stickies don’t need saving, you can make notes, dot them around your screen as reminders, and they come in a variety of colours.

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Take Control ebooks (affiliate link) are superb.
I do some of my best learning from them. Buy through my link so I can make more and better Tips.

Take Control of Using Lion.  Buy Take Control of iCloud.  Macworld iPhone 4S Superguide  Take Control of iTunes 10: The FAQ, Second Edition