I believe I already sent you an email about this, but I'm not sure if you got it, or if I got a response.
I would be interested in implementing this for you. I really have no idea what's involved or how long it would take, but I assume it would be a 2-3 day project.
If you would like to fund the development for this project, I would be willing to integrate Quickbooks 2009 into Ubercart 2.x and Drupal 6 for a fee of $300 USD, with a $100 deposit and will accept bonuses after a job well done 