HI THERE GANG! If you don’t like long-winded introductions, skip to the bit starting with “THE NITTY GRITTY”.
Getting Things Done (GTD, see here for the book, here and here for introductory information, and here for a cool workflow diagram) by David Allen is a master-piece. Having read it, most of it kind of fits. It’s almost as if, if one had had the time to sit down and think for long enough, one would have come up with the same brilliant tips. But one hadn’t, so one didn’t. The Delete-Do-Delegate-Defer monster, contextual todo-lists (Work-Computer, Home, Calls, Errands, etc.), the Weekly Review(tm) and actionable next actions are some of the most valuable things I picked up when I read this book about a year and a half ago.