i know you are interested in setting up a paperless office and when i found that website i thought i should tell you about it : http://www.xamance.fr/.

It is far from free but the concept is interesting :
- you put the paper in the scanner.
- you push the button.
- the document is read, saved and plain text search enabled.
- the physical document fall in a box and the software remembers in which box and which position in the box.
- you enter some keywords to find the document and you can either print it or find the original one in the box number 5 at the 23th position starting from the bottom of the box.

It would exist for a lower price i would give it a try.

J.