Imperial_Samura
Anticrust Smurf
Is it possible that R.A.B. could be more then one person though? When I first read HBP my first guess was Regulus and the locket at Black's house, as the name fit. But then I thought about how difficult it was for Dumbledore to get the fake, he wasn't able to do it alone, and without Harry's help who knows what might have happened. That and Regalus was mentioned so passingly and didn't sound very powerful. Ergo I then assumed he must have had help.
I also wonder about how, if it is Regulus, he found out. After all, it seems like this is Voldermort's greatest secret, it seems odd he just happened to share it with the one Death Eater who got cold feet (perhaps) and decided to destroy a bit of his soul when he has so many other fanatical, possibly more powerful followers. And if it is indeed he why did he do such a limited thing, why not take the info to DD or something, if he was able to get away long enough to snatch the locket and possibly work out how to deal with it surely he could have got the info to someone else...
And of course where is the locket now, if it is the one at the Black house it might have been thrown away, or stolen... unless Kreacher got it. Still, I think Regulus is still the most likely, though it will be interesting to see it is all explained.