Conspiracy Theories (1987) edited by Chris Evans
Martin Gardner's "Mathematical Games" Collections
A.P. Herbert's "Misleading Cases"
Josh Kirby's SF/Fantasy Covers
SF Fan Stuff by Others
Jackie! All the Famous Braodsheets by various anonymous hands [PDF]
"Egoboo for Algernon" by Terry Carr
Rob Hansen's Then (a history of UK SF fandom)
"Blast Off 1960" by Mike Moorcock (from Bastion #1, August 1960, ed. Eric Bentcliffe) [PDF]
"Why Gandalf Never Married" by Terry Pratchett
"Martians in Exile Certificate" awarded by Bob Shaw [PDF]
The Eye of Argon by Jim Theis Introduction and links
The Enchanted Duplicator by Walt Willis and Bob Shaw
UK SF Fandom Archive (which once hosted much of the above)