Petz.com - the official Petz website
Where's the COB? - an excellent site for finding COBs
The Norn Underground - a good site with some excellent tutorials on making COBs
Albia 2000 - another great Creatures site
Petz Information & Adoption Centre (P.I.A.C.) - an excellent Petz site
Cover Petz Modeling Agency - a fairly small site but very nice