Great resource from Thorin Klosowski … Create Ebooks from Wikipedia Articles for On the Go Reading Anywhere:
Ever wanted to take a few Wikipedia articles with you offline? You can now export any Wikipedia article, or a collection of articles, into a personal ebook that's readable on any device that can use the EPUB format.
To enable the create a book function, click the "Print/export" button the left side of a Wikipedia page, and select "Create a book." This starts up the book creator. From here, you can add as many pages as you like to you book by clicking the "Add this page to your book" button at the top of the Wikipedia articles you're on.