Hey James,
I just wanted to thank you for what you have created!
Ever after I listened to the “Getting Things Done” audiobook by David Allen, I was fascinated from the GTD method. But as much as I tried, I could just not get a grip of it. I tried a lot of different tools, but it was never easy enough to be motivated in the long run. Although there are still some issues here and there (Filtering! 
), GTDNext is the first tool, that made GTD really work for me.
On my quest to find the right software I met a lot of very committed people (Hi Folke) who as me tried to find a tool, that did not just GTD buzzword bashing but engaged in the philosophy the same way they did. I found a lot of them in these forums again. You’d better be listening to them, they want the right thing!
Please continue to improve this already very sophisticated product and you will be able to finally create the holy grail for the GTD community. And then nothing can stop you! 
Keep up the good work!
Regards,
Toni