General Interest: J.K. Rowling updates on Current Whereabouts of Harry Potter, Ginny Potter, Ron Weasley, Hermione Granger, Neville Longbottom, Luna Lovegood, and the rest of the Weasley family (requires Pottermore log-in, or read it here).
Nifty: Check out this beautiful deck of Harry Potter tarot cards: A Potterverse Tarot