Hi, I released a new product (http://www.WindowTabs.com/outlook.html) a few months ago. I don't use GTD but several of my customers do, they like WindowTabs because it helps them organize all their open Outlook email windows and group email windows based on the projects they are working on.
I also saw this thread here in the GTD forums (http://www.davidco.com/forum/showthr...abbed+outlook).
Maybe some of you will find it useful too. There is a free trial and a short video so you can see it in action http://www.WindowTabs.com/outlook.html
Email me if you have any questions, I will also keep an eye on this thread if anyone has any suggestions for how I can make WindowTabs more "GTD" friendly!