GTDGmail is coming?

From their website: “GTDGmail is a Firefox extension that integrates the highly effective methodology of “Getting Things Done” into the popular email service Gmail.”  Well, that sure looks interesting to me. Too bad you can’t download the extension yet but you an sign up for the notification if they go live. I wonder how this extension will live next to my Gmail Macros for easy archiving and keyboard-usability (you can see a Shortcut Sunday coming for that one don’t you?)