Tom’s Hardware has taken a look at the DocuPen R700 mobile scanner that is listed in the Guinness Book of World Records as the smallest scanner in the world. The pen scanner has 2 MB of on-board memory and uses USB to transfer scanned pages to the computer as well as charge the unit. The review has some photos and a video of the DocuPen in action and some scan quality comparisons. If you are looking for a mobile scanner I don’t think you can get smaller than this so check out the review. You will find a lot of DocuPen videos on the DocuPen web site.