Firesign Theatre Canonical irReference
Excruciatingly thorough or thoroughly excruciating - you decide.

Jerry Stearn's Firesign Page
Also from before the beginning, by a radio/scifi practitioner/fan.

The Unofficial FST Home Page
The one that started it all. A drip 'o' the firehose to Niles Ritter!

Sir Will's Home Page
Everything you ever wanted to know about The Old Same Place but were afraid to ask.