Places to get free ebooks and other literary content.
Bookyards - "The Library To The World", freely available books, educational materials, and content.
FreeComputerBooks.com - Free books and lecture notes covering technology and methematics.
Internet Archive - Non-profit founded to build an Internet library. The purpose is to provide everyone with permanent access to historical collections in digital format. Since 1996 the archive has been receiving donations and now includes texts, audio, moving images, and software.
ManyBooks.net - Free creative commons and public domain works, a good deal of Project Gutenberg content is here too.
Project Gutenberg - Over 33,000 ebooks available for PC and multiple mobile formats. Project Gutenberg was the Internet's first ebook archive. Copyrights have expired in the US.