It seems that the three German hacker books, Hackerland, Hackertales and No Copy, by Sen, Moschitto and Krömer are available online as pdf files under a Creative Commons license. Check out these links: http://pdf.textfiles.com/books/hackerland.pdf, http://no-copy.org/hackertales-download.html and http://no-copy.org/no-copy-download.html.
Fixed the No Copy entry to contain the correct authors (Krömer and Sen).
Quite an extensive set of articles on the history of Commodore Amiga from a gaming perspective, published by Ars Technica: http://arstechnica.com/gaming/news/2010/06/shadow-of-the-16-bit-beast-an-amiga-gaming-retrospective.ars/
Markku’s licentiate thesis Computer Demos — What Makes Them Tick? (Reunanen 2010) was accepted yesterday. A licentiate is a bit of an oddity, an intermediate degree between M.Sc. and PhD, that exists in that form only in Finland and Sweden. Thanks to everybody who contributed and commented (esp. Antti)! The thesis can be downloaded here: http://www.kameli.net/demoresearch2/reunanen-licthesis.pdf