Best Places to Get Free Books (según lifehacker.biz)

• BizBooktalk - Free book giveaway contests on Fridays
• BookCart - Internet paperback exchange
• SF-Books - Exchange Sci-Fi Books here
• PaperbackSwap - Swap books for free
• MoochMuch - Organize your book lending with your friends
• CHMPDF - A collection of general interest and technical e-books
• LibraryElf - The perfect companion to a public library system
• Scribd - Open library to publish and discover documents online
• Online Books Page - Facilitates access to books that are freely readable over the Internet
• Podiobooks - Free audio books that you can subscribe to with iTunes or any other pod catcher
• BookRags - Research material in the form of eBooks
• Technical Books Online - Old tech books from the “vacuum tube age” of electronics
• Word Public Library - PDF ebooks for download
• Free Tech Books - Free computer science and engineering books
• Gutenberg Project Top 100 - Popular books from the oldest producer of free ebooks on the Internet
• BookMooch - Community for exchanging used books
• ebookSpyder - Specializes in technical books ranging anywhere from C# to AJAX
• Google Book Search - Read the classics online
• Dwalin - Plain text novels
• Free Computer Books - Technical resources about computers
• Librivox - Audio works and podcasts of books
• CliffsNotes - Get the notes to cram for the exam
• WIkibooks - Free textbooks
• DailyLit - Receive small parts of books via email
• ManyBooks - Free eBooks for your PDA, iPod, or eBook reader
• BookCrossing - Where real books are released into the wild to be found by others
• Bookins - Swap real books with other readers
• WellToldTales - Free short story podcasts (like audio books, but shorter)
• Realtime Publishers - free IT eBooks by many of the world’s best authors
• FrugalReader - Trade Books for free
• TitleTrader - Swap books, movies, and music
• ZunaFish - Trade your old media and books items for new titles you’d rather have
• SwapSimple - Swap your used books here
• PinkMonkey - Study Guides
• eBookWorld - Technical resources
• Flaxx - IT and computer books
• Baen Library - Free science fiction and fantasy novels
• LibraryThing - Social networking and free books
• ebookSearchr - Google powered
• Internet Archive - The Internet indexed - that includes a vast text library
• BookYards - Books, videos, education materials
• Memoware - Free books for your PDA