Here is a fairly cheap and easy way of scanning any document straight into your iPad, simply place the tablet into the dock, scan the document through the scanning device and manage these documents with the free app from iTunes.
These are the features and details for the iConvert Scanner for iPad Tablet;
Quick and simple way to scan documents to JPEG files
Saves photos and important documents directly to your iPad tablet
Scans high-resolution 300dpi for clear, crisp images
Adjustable feeder adjusts 2″ to 8½” wide to fit many sizes, from small photos to full-size documents
Works with the free downloadable App at the iTunes® AppStoreSM
Gives step-by-step prompts—“scan” (with real-time preview), “save” or “delete”
Compact size for easy transport. Measures 12.1″w x 4.4″d x 2.8″h and weighs just 1.44 lbs.
Powered via AC adapter (included).
System requirements: iPad 2 or iPad with iOS 4.3.5 or later
Priced at $150 or £96