Cool Mini or Not has become a mainstay in the miniatures community. You'll find forums, articles, and, oh, about thirty thousand images of miniatures. Just remember that New Wave is a partner. You've been warned.
Terry Adams' Electric Ocean is the place to go for the lazy. No more checking the websites of dozens of individual painters, hoping that they've finally updated their sitecough cough. All this information is conveniently collected here in one place. A serious time saver. I check it every day. But I can quit anytime I want...
The Miniatures Page is just what it says The Miniatures Page. There are frequent contests, bustling forums, and loads of updates, many from smaller publishers and manufacturers that you won't find anywhere else.