J.K. Rowling has written Beedle The Bard (of which much mention was made in The Deathly Hallows), but only seven copies have been published. Seven? As the article says, she is giving six aweay as gifts and the seventh (which is all souped up in Moroccon leather and gilded is silver and jewels and what not) is being auctioned off for charity at a starting price of $62,000. Good heavens.
Also, she is going to be working on a companion book for the Harry Potter series. My understanding is that it will be an encyclopedia all (or at least a lot of) things Harry Potter. This may be the answer to solving the Dumbly-gay problem. I just hope that she'll make it believable.