Out of date books

Argh!! I've got out of date manuals! The book on Postfix that I own is now five years old and is now obviously out-of-date as I had to Google for the proper configuration for aliased/fancy addressing. I wonder if electronic paper will ever get to the point where we can have portable 10-15 page devices that contain entire (multiple) manuals that are automatically updated? I'd pay a small fee for the service.