What other books did JK Rowling publish besides Harry Potter series?

As of January 2008, JK Rowling has published seven books in the Harry Potter series. In addition she has three other books. All three books are supplements to the Harry Potter world. In 2001 Fantastic Beasts and Where to Find Them and Quidditch Through the Ages were released. The third book Tales of Beedle the Bard was not publicly released. It was sold at auction for £1.95 million. She has stated an interest in writing a Harry Potter encyclopedia as well as venturing writing outside of the Harry Potter world in the future.

Tales of beedle the bard was publicly released.

A previous book may have been published, unrelated to Harry Potter, although I am not sure what it is called or if it even exists. An 800 Word prequel to harry potter has also been published.