iPads and iPhones do so many things. Scanning documents is another task iOS has taken on, and an app called PDF Scanner (US$2.99, universal) does the job quite well.
To get started, just point your iPhone's or iPad's camera at a document or book, and the app focuses and creates a clear scan of the text. What's nice is that PDF Scanner can recognize a book open to two pages, get both sides and create two separate PDF files ready for export. Without that feature, you would do a lot of cropping to get everything just right.
You can tell the app to scan in color or black-and-white. In my tests, I was just doing text so I opted for monochrome. The results were very sharp. Once the scan is done, you can open the file in any app that supports PDF format. I had no problem using iBooks or the Kindle app. You can also send the file to various cloud-based servers like Google Drive. You also get an option to mail the file, send it to Dropbox, move or rename the file and print it. On my laser printer, the scans were tack sharp.