Floo: Hufflepuff Common Room

This is a huge fan fiction and fanart site dedicated entirely to "Harry Potter." The stories are divided into categories and there is a good search function so you can easily find what you want. Each story is also checked before it is posted so they all have good spelling and grammar. There are also a ton of discussion forms.

Art Dungeon.Net A fabulous personal fanart site with a ton of drawings from Order of the Phoenix as well as drawings and sketches from the other books.

accioBRAIN! An absolutely fantastic fan art website! It is the personal site of Makani, who does some gorgeous work. There are both single pieces and hilarious comics.

This is a fantastic personal fanart site with drawings of a wide variety of characters done in several different mediums. It is available in both English and Spanish.

The Werewolf Registry A Remus Lupin site with a large, quality fan fiction archive, information on Remus and werewolves in general, fan art, information on the moon, forums and more!

Kwikspell Blends A great blends challenge site with regular challenges.

Bluefox Fanart A small personal site with fan art from different fandoms, including some nice art of Severus Snape and a few others.

Weasley Network A large site dedicated to the Weasley family with a fan fiction archive, fan art, information on each family member as well as their home, pets and distant family. There are also a whole host of other stuff as well.

The Black Sisters A site featuring Narcissa, Andromeda and Bellatrix Black with information on each of the sisters, fan fiction, fan art, rumors, excerpts, a family tree and more.