Is this any different to "Save as PDF"?
I mention a few low hanging fruits in the talk like "print to bookkeeping" - but that's just one use-case. Consider that you can use it as a printing proxy and divert jobs to different printers or implement an authentication system or a payment system before printing. There are a lot of options...
Might even be able to combine with GPS info in the image to log where the receipt is from, etc.
This could be a pretty decent idea for adding to online bookkeeping services... so that you can tag receipts, for tracking the taxable portion of them, etc.
Advance print queues for printing services could be another thing...