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The full text of this O'Reilly book has been made freely available online.
http://www.oreilly.com/catalog/opensources/book/toc.html
All-encompassing book on using open source software, which itself is open source and available online.
site exerpt
The Linux Cookbook: Tips and Techniques for Everyday Use Signed copies are now available direct from the author at 25% off! Price includes free shipping in the United States! Buy it now with PayPal for immediate shipping by clicking on the button to the left. You may also pay...Full text of Peter Wayner's book, subtitled "How Linux and the Free Software Movement Undercut the High-Tech Titans". [PDF]
http://www.wayner.org/books/ffa/
Features several open source books.
http://www.verbbooks.com
Book by Karl Fogel. Full text freely available as HTML, PDF, and XML.
http://producingoss.com/