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Finally! Looks like a nice piece, will take a look at it :p

http://www.blackberryinsight.com/2006/10/09/nextaction-the-gtd-implementation-suggestions/

Please tell us your opinion on NextAction! - The GTD Implementation for BlackBerry.

It seems there is now also a site available of them: http://www.next-action.com/

If have also asked (some time ago) via email about the purchase procedure and they told me that you will have a...

blackberryinsight.com has an article about implementing GTD with a Blackberry:

http://www.blackberryinsight.com/2006/05/13/implementing-getting-things-done-with-your-blackberry/