I'm intrigued by the whole Regulus/locket connection. I still believe that the locket mentioned so briefly in OOTP is the very same locket taken from the cave by RAB. I have been trying to put key events into some kind of chronological order, working on the premise that HP's sixth year at Hogwarts corresponds with the 2004/5 school year in the real world (just for convenience). I'll post it when I have it roughed out to see what everyone thinks.
Of course I can! schwing_wifey- you're added!
A couple of weekends ago I was knocked down with a sinus headache and caught Chamber of Secrets on ABC Family Channel. I got out my CoS book and re-read the part when Harry ends up in Nocturn Alley. I believe a locket is also mentioned there. Of course, I was all doped up on sinus medication so I could be completely wrong.