Warehouse express - the one stop shop for camera and photography equipment. Although you may find cheaper once every now and then at your local camera shop, generally you will be hard pushed to find consistently cheaper prices on top product, and with next day delivery, you can't go wrong. These guys are highly recommended.
Wild arena - one of the best sites you can visit if you want to photograph wild animals. They run UK tours and workshops at the country's top zoo's and safari parks as well as over seas excursion. Pretty pricey but top of their class and well worth every penny.
Purestorm - a great networking site that's free to join for models and photographers. As well as being able to get work here, there's also a great forum for you to take part in.
The photography-forum.org is one of the friendliest places on the net for photographers and would be photographers. If you want to learn anything about photography, this is the place to be.