Steve Barsky's "Simple Guide to Rebreathers" if you can track down a copy. It's out of print.
Bozanic's book is much more in depth, but just about the only RB not featured is the Inspiration.
Still, it's currently the best book out there.
Plenty of Inspiration info, including a sobering analysis of accidents, can be found on
the
Diver Mole - Your Insoiration Buddy website.
Mad Dog Expeditions and Ken's Science Store made an excellent video/DVD called "Rebreather Video Volume 1". It covers the basics about rebreathers and a close look at five different models, the Cis-Lunar MK-5p, MK15.5, Dräger Dolphin, SMI PRISM Topaz and of course the Inspiration. A review by me is somewhere here in the archives, as well as a copy of it on Rebreather World.
IANTD's Joe Dituri also made a DVD called Rebreather FUNdamentals, it's available through the agency, Dive Rite Express and on e-bay. A review again can be found at Rebreather World.
The Winter 2004 issue of
IANTD 's Nitrox Diver Magazine had CCRs as their main subject, covering a dozen models and two CO2-related articles on that are very intresting.
Ron Micjan has several teardowns as well as a chart comparing rebreathers on his
tmi website .