I am currently trying to use Microsoft OneNote 2007 to track projects and Outlook 2007 for next actions. OneNote allows you to capture information for your project in numerous ways. You can create an outlook task from within OneNote make the category of the task project and you have a project created in outlook. The outlook task has a onenote link embedded into it that links back to the project page in OneNote. I like it so far but I am not a very experienced GTD'er.