Douglas W. Jones site A good collection of information on the PDP-8 and more links. Author of the PDP-8 FAQ's
Sunsite Archive A large collection of PDP-8 software, source and binary
John Wilson and Lee Nichols Software and OCR'd documentation
Vintage Computer Festival, see links for sites on many different old computers
pdp-8.org More PDP-8 information and paper tape images
www.bitsavers.org Many scanned manuals and some software for DEC and other machines.