In the past, I've written a lot about Getting Things Done (GTD) and my journey with it. One of the shining points along the way was finding ClearContext, which is an Outlook add-in for WIndows that transforms how you can use GTD with Outlook. I've written a lot about ClearContext, as well.
As you may also know, I switched to the Mac about a year ago and one of the hardest things to do without has been ClearContext. I'm now using Outlook 2011 for Mac, but it apparently isn't quite as extensible as the Windows version of Outlook (I'm hoping Microsoft addresses this crippling limitation in future release of Outlook for the Mac).
Anyway, if you are looking for an awesome product to help you up your game with GTD, I encourage you to check out ClearContext. Their latest release (which a few of my colleagues are using) has a lot of new functions to help automate a lot of the categorization, filing, and other kinds of mundane tasks so you can better focus on getting your work done efficiently.
If you've never looked at ClearContext, start with the intro video before, then head over to the ClearContext site for a free trial. If you've looked at ClearContext before but not acted, give it a second look.
And Microsoft: If you're listening, please open up Outlook on the Mac to enable fantastic products like ClearContext.