Pink Poogle Toy Forum

Those, plus Battledome challengers [I only know of one site with a list] and scam warnings, like everyone else has said.
For the scam warnings, see LupeMoneyTeller's pet page. It also has links to others [I think.]
For avatar help, just hunt around. I use Jenodnile's guild for that.
For the hidden places, I use http://www.nothingbutneopets.com.

Actualy, I have found a site that has more stuff than nuttyaboutneopets. It's called http://www.nothingbutneopets.com. Also, when I started playing I don't remember having too much trouble with the website. Mabye it's because I'm a bit of a book worm and like to do lots of research.