From Mariner Software:
One of the only eco-friendly software packages for Mac OS X, Paperless is software that cuts through the clutter. Simply scan receipts, warranties, deposit slips and other paperwork. The Optical Character Recognition (OCR) in Paperless automatically recognizes and helps categorize documents. Built-in search functionality will find and assist in organizing receipts and documents into collections or Smart Collections. Already have your documents as PDFs or other file formats? No problem. Simply drag and drop them into Paperless. With Paperless, creating digital records and organizing them is easy and intuitive.