Web module to generate galleries for Adobe Lightroom and/or Aperture would be fabulous. There is a lot that can be done. I would love nice integrated shopping system in the galleries - this give me the biggest headache and so far i have to look for other product or outsource the online prints sells somewhere else.
It does not necessarily has to be integrated with online printing business, but the payment would be probably best to integrate with paypal.
All i want is to receive the payment, list of photos that the visitor ordered with specified features that we can define as well as prices - example:
I believe there is a huge demand for this solution - people like me would pay for this to get it all in one package.