Thanks to http://www.quakewiki.net/ and other mirrors we've got planetquake and quakesrc tutorials preserved, and inside3d has QIP. What other history is out there?
web.archive.org wayback machine saved some surprisingly obscure stuff-
Quake Weenie (strategy guide)
http://web.archive.org/web/200106040817 ... com/quake/
Quake Source Mailing List, although very little was archived. 'oldman' must be really old by now.
http://web.archive.org/web/200105240846 ... ?by=Thread
Quake on lcc compiler, when MSVC wasn't free
http://web.archive.org/web/200106020405 ... quake.html
Quake Tips and Tricks from Stomped.com
http://web.archive.org/web/199904240054 ... ricks.html