Welcome to "Wiki as E-Book". Here you can find a massive encyclopaedia (several GB) available for your e-book-reader or for your computer. No matter where you are, it is a lot of fun to stumble through this intriguing collection of in-depth knowledge.
Before you buy (3€/4$ per Volume), try out the Example E-Book and view it with your e-book-reader or computer software (e.g. FBReader).