First of all --- anyone considering purchasing NA for the BB should just get it already. Yes its expensive for a small app that really doesn't "do" much, but I'll tell you first hand that NA makes accessing my tasks lists SO MUCH MORE RESISTENCE FREE. And that's critical to a healthy GTD system.
One minor flaw is that it appears that you can't filter out completed tasks. Not only that, but completed tasks appear mixed in with all the other stuff. Its really unproductive to have to keep looking at stuff you've already done, don't you think?
Any other NA users that have found a fix to this? I'd love to hear it.