If would like to collect your favourite Wikipedia articles and store them for future reference in a printed form like a book, PediaPress lets you do just that. Wikipedia, the free encyclopedia that anyone can edit, has a huge collection of articles about every topic possible.
PediaPress is a service that enables you to compile and order a book with contents you pick from Wikipedia articles. The goal of PediaPress is to make this knowledge available in a printed form and promote the offline usage of Wikipedia articles.
Search and add Wikipedia articles you want in your personal book. Enter a book title and an editor name. Preview your book in PDF format. Order your book, pay with your credit card and the book is printed immediately and usually shipped on the same day.
How can they use Wikipedia content like this? They say all Wikipedia text is available under the terms of the GNU Free Documentation License. GNU Free Documentation Licence formulates the conditions under which Wikipedia articles may be reproduced.