With sections and links devoted to history and technical information.

History and Technical Info:

Page 1 -- intro, dialing basics
Page 2 -- routing system
Page 3 -- Ma Bell's Big Mistake
Page 4 -- The Blue Box
Page 5 -- other boxes
Page 6 -- conclusions
Page 7 -- sources/links

Tone Sampler (Javascript) -- hear Blue, Red, and Green Box tones. (Click here for a non-Javascript version.)

Amusing stuff -- scanned from old issues of TAP Magazine:

AT&T vs. TAP article from the Village Voice
TAP's long-distance Black Box rates comparison chart