Pern

Shadow Weyr
A Neopets-based roleplaying guild set on a lush southern island in the Third Pass with unusual dragon colors and a new ferret-like species called Shyaths.
http://www.freewebs.com/shadoweyr/

Wild Sea Weyr
A Neopets-based roleplaying guild that allows white dragons, but no other mutations.
http://allanor_goldrider.tripod.com/