If you a) are crazy like me and use a Mac, b) use Apple Mail to manage your mail, and c) especially if you have a widescreen monitor, you owe it to yourself to give this plugin a try. It’s not quite as good as Outlook’s take on the same idea, but still pretty good, and improving rapidly. And on top of that, it’s free.

Or you could just wait until the next rev of OSX and pay $129 so that Apple can make it one of their “200 new features”…