The Harry Potter Lexicon
Webmaster Steve Vander Ark's work on this site is absolutely unparalleled. This website is, quite simply, the ultimate Harry Potter resource.
The Leaky Cauldron
A fantastic source for Harry Potter news.
The Akashic Record
Another great HP etymology site.
Magical Worlds of Harry Potter
A book by David Colbert. Gives readers a taste of the real folklore and legends JK Rowling borrows for her books.
HP Monthly
A fanart challenge run by my close friend Alice Wack.