It’s a simple question that built the Twitter empire 140 characters at a time. What are you doing? And yet, I feel that although I use Twitter fairly often, I do not actually ask myself that question enough throughout the work day. How many times have you found yourself wasting what would be otherwise productive time doing something… well, unproductive? If you’re a regular reader here, then you’ve heard of Merlin Mann by now. I’ve written about his sites, and I’ve written about his Inbox Zero solution for e-mail (which I will swear by for the rest of my life). It won’t come as a surprise then that the Mann who built the 43 Folders site on the principles of Getting Things Done and general productivity has once again come up with a nifty little tool for staying on track. ...