ScanTailor - Scan Tailor is an interactive post-processing tool for scanned pages.
Docr - Docr is a free app for the iPhone smartphones that lets its users scan all of their documents into sharp images and, in the end, store them as PDF files.
YASW (Yet Another Scan Wizard) - Download YASW for free.
Scanner Pro - Scanner Pro turns your iPhone into portable scanner in your pocket.
PDF Scissors - Crop pdf. Drop margin, whitespace. Auto crop all pages. Easy feature to make nice cropped pdf for ebook readers such as Amazon Kindle, Sony, Cybook etc.
Tiny Scanner - Fast and easy to use mobile document scanner.