Ebifly's Website - Japanese only. There's several pages with catgirls -- Some normal, some adult.
Favorite Empress - Like many Japanese sites, the English title means nothing at all. But this one specialises in catgirls! Mostly Japanese, with a little English.
Nekosei - The home of several catgirls, among which, Keicha. ^_^
Tails Factory - Japanese only, fanart of catgirls!
Wilde Home for Wayward Catgirls - Lots of very nice catgirl artwork here, with a refreshing change in organization.