1. in OOTP, the gang find a "heavy locket that no one could open"...could this be the missing horcrux? most likely. if any1 wants to look it up, i forget what page it's on, but it's around the time where Sirius shows Harry the tapestry and then the eat lunch
2. someone on Mugglenet.com wrote an amazing editorial about Kreacher's place in the story. Is it possible that he was the one that helped Regulus get at the locket. Since the boat was too small for 2 grown wizards, Kreacher would have fit perfectly. OR - Regulus could have died and Kreacher bring the locket back to the house...?
3. in the interview that Mugglenet/TLC did with JKR the conversation went like this:
[MA stands for Melissa Anelli of the Leaky Cauldron]
JKR: Ohhh, good.
JKR: No, I'm glad! Yes?
MA: Can we figure out who he is, from what we know so far?
[Note: JKR has adopted slightly evil look here]
JKR: Do you have a theory?
MA: We've come up with Regulus Black.
JKR: Have you now?
JKR: Well, I think that would be, um, a fine guess.
MA: And perhaps, being Sirius’s brother, he had another mirror –
JKR: [drums fingers on soda can]
MA: Does he have the other mirror, or Sirius’s mirror —
JKR: I have no comment at all on that mirror. That mirror is not on the table.
if anyone wants to read the interview it's on The Leaky Cauldron and Mugglenet
what does every1 think? have you come up with anything else?