An online book about website performance by Stoyan Steganov, released into the public domain. Excellent!
A handy template for releasing code into the public domain.
Help keep your culture error-free by proof-reading small pieces of literature from Project Gutenberg.
Tantek talks about the importance of open media for the longevity of data.
Jessica's English translation of a 19th Century German poem in the public domain – possibly the only English translation of this poem in existence.