My Cat Hates You: Pictures of upset/pissed-off looking cats.
Stuff On My Cat: MANY pics of cats with things stacked on them (warning: some of the cats are wearing costumes)
The Most Beautiful Ugly Dogs: A website with an interesting name about bull terriers.
Ugly Cat Contest: Apparently there's a family that attracts ugly cats... and they put up this website.
Rat Palace: A very nice website about pet rats with a great gallery.
Frolic Dot Org: A humor site devoted to one very happy llama.