In the past, I've posted quite a bit on how I use ClearContext as a lever to become more effective with Getting Things Done.
If you'd like to benefit from some best practice documentation for using ClearContext with GTD, check out this awesome resource provided by Brad and the team at ClearContext. I was privileged to have the chance to review this before it went live, and I am very impressed with this clear, concise guide they've created.
The guide applies to both new (Outlook 2007) and older versions of Outlook (I use Outlook 2003) and is a must-have for any GTD'er that is using or considering ClearContext.