If you're looking for a concise article discussing the basics and merits of Allen's Getting Things Done (GTD), take a look at Time Bandits by Chris Tucker which gives the following introduction:
"Think there aren’t enough hours in a day? Then you haven’t met the devotees of GTD."
Tucker gives a sweeping overview of GTD and shares the comments of one GTD believer who seems to have gotten life under control thanks to the system.