>   I seem to remember reading in an issue of ;login: that 2.11 was the final
> release, built to comemmorate the 20th anniversary of the PDP-11.

2.11 has had several hundred patches released for it.  its official maintainer
is steven schultz, sms@2bsd.org or some such.  it's actively used, probably
with as many running systems as 4.3-reno on the vax.