I replied to the other thread, but I'll post it in here too, in case anyone else is looking for piggie sites.

This one looks the best to me, you have to sign up to use the chatroom or message board, but it seems safe and there's tons of information:

Guinea Pigs Unlimited

I haven't had a good look at these, but they seem good too

Cavies Galore

Practical Pet Care

Cavy Madness

Piggy Palace

Wheek All About It

Guinea Pigs World

Cavy Compendium

Hope that helps