I just read an article on J.K.R.'s official site... She has confirmed... Neither Harry nor Voldemort is the Half-Blood Prince. Not really surprising to some, but just to clear that one up for others, I thought I should share it.
Just some random facts from J.K.R.'s site... (I don't know whether these will be of any significance, but...) You can find more on J.K.R.'s site (see the above link).
Mr. Arthur Weasley is one of three brothers.
Ginevra "Ginny" Weasley is the first girl to be born into the Weasley family for several generations.
I'm having a rough (but exciting time)trying to skulk about this official J.K.R. site, looking for clues to sate my curiosity about the sixth book. Until then...