GTD practitioners yearning for ways to handle projects and such will likely by interested in Microsoft's new OneNote application. It's not perfect, of course, but it is coming out of the gate with some interesting possibilities. Integration with Outlook Tasks, Contacts, and E-mails should peak some interest.
Many of you will also find the "Open Letter" at http://www.mobiletrax.com/im/20030203.html quite interesting. Follow the link at the bottom of the letter to explore OneNote.