alright, so we have some good ideas... mark evans seems believeable, ..it would be neat to see tom riddle have a son before he turned totally crazy... also..everyone is so convinced malfoy is not the halfblood prince just because rowling says he is a pureblood... maybe his perfect pureblood mother has a secret... maybe she had an affair... i know this sounds harsh but.. also hagrid is a good candidate though it would be neat to see dumbledore as a halfblood as well. i dont think that the halfblood prince is going to be anyone already known to be halfblood...that is just not rowlings style, and why is he given the title of prince... he cant just be some regular joe... we must remember, rowling WAS going to name book 2 hp-hbp, but she didnt, this means whatever information or hints that were going to be revealed in the 2nd book werent. i never remember rowling stating that the hbp was introduced, or played a part in book two, so dont go looking for answers were u may not find them... i liked one persons idea of HP having a brother or twin... who lives, identidy covererd, with muggles, maybe the kind and queen? but if thats so... and harry does have a brother.. wouldnt this brother get a hogwarts letter when harry did... is it not required to go to hogwarts, even if you have wizard blood... is harrys brother at hogwarts?..... i dont know... everyones answers are so believeable... personally, im sure rowling will shock us all as usual, regardless of who the prince is..