Until someone writes something interesting, here's Gordon's homepage and his book, "Computers in Communication" (pdf).
Gordon was quoted (I hope, mis-quoted) in a Computing article.
A quick look through my history box (Gordon writes) yielded, on paper:
sources for all my Vax networking stuff
EMAS and EMAS 2900 reference cards
ISYS system documentation
HAL 7502 manual, and 7502 "OS" software (Hamish also has a paper listing of some of this, not all)
ISYS 80 manual, Filestore manual and HAL 70 manual
ECSD LISP manual (Nick Shelness)
We've found that online in the EMAS archives -- Graham
Noddy Goes to the Machine Halls (Kathy, 78/79)
Sticks & Stones manual (Luca)
my CS4 operating system
DEIMOS PDP-11 OS (by Brian Gilmore - now Director of EUCS)
We've actually found the full DEIMOS sources in the EMAS archives -- Graham
ISYS 70 source
PDP-9/15 source
a few bits of EMAS 2900