In case you haven't heard, J.K. Rowling was asked last week if Albus Dumbledore ever experienced romantic love, and Rowling revealed something that never appeared in the books: she'd always thought of Dumbldore as gay. This revelation makes sense of something in the last book that was a little puzzling otherwise, but I won't get into it in case anyone hasn't read the book and wants to get into it spoiler-free. I wish I had the time to write up my thoughts on this, but I'm glad someone has saved me the trouble. Travis at Sword of Gryffindor has already written up most of what I'd want to say:
See also the two comments linked to at the top of his post, in the update. If you haven't read the final book of the series, beware of spoilers in any of this.