While a bit out-dated (2005, and believes SnapexLily to be non-existent), Fernwithy on livejournal intelligently defends of crushes various character pairings in the Harry Potter books.
Yesterday on BBC Radio Five Live Radio Simon Mayo, auteur Ian Rankin, a friend of J.K. Rowling, revealed that the last time he saw her, she was working hard on the Encyclopedia. He also mentioned he saw her drawing up family trees.