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I don't usually just provide a link to a posting, but this one by Merlin Mann on GTD contexts was stellar for its brevity, wit and usefulness. It includes a 90 second GTD overview—very handy in and of itself, an exploration of why GTD contexts are so damn useful, and a quip that made me actually laugh out loud. If that isn't enough to warrant a link to another post, I don't know what would be.