There are hundereds of CDTV, A570, CD32 and other great Amiga resources on the internet,
Here are the best:

Amiga CD32 & CDTV Forum:
A large and very busy forum for CDTV, CD32 & A570 units.

CD32 Allianz:
A large and active German website covering the Commodore CD32.

Amiga Interactive Guide:
Information on every Amiga past, present & Future with lots of details on prototypes.

Zimmers:
So what did Commodore make? Well the webmaster of this site has almost everything, From typewriters, phones & watches to all the Amiga`s including the CDTV, CD32 and CDTV CR prototype, Well worth a look..

Workbench Nostalgia:
Want to know about the CDTV`s OS? This site is dedicated to every revision of the Amiga`s Workbench (OS), Including early beta`s (V0.8) to OS4.0.

The Big Book Of Amiga Hardware:
A site dedicated to general Amiga hardware including custom chips, CPU`s, Amiga models, prototypes and every upgrade ever made for the Amiga.

CDXL Information:
A German website covering the CDXL video format used on the CDTV & CD32, The author also sells CD`s full of CDXL video clips. (I dont know how old this site is).

Amiga Inc:
Amiga itself..... well the trademark anyhow