There is a site called "In Pictures" which is offering basic computer how-to books that are based on pictures, not just text. These books demonstrate how to use different applications (such as Microsoft Office, OpenOffice, etc.) and operating systems (like Microsoft Windows, Apple OS X, etc.).
Here are some sample pages from a typical In Pictures book. These books are meant for the beginning computer user on how to use these applications and OSs. These books are not meant to be extensive references.
Currently they have 22 books available on their site, which can be downloaded in the PDF format. If you act before the end of July, they're offering free downloads of all these computer books.