I was wondering last night about what Dumbledore was going to tell Harry, you know, in the segment they read out at the conference where they told of the books' release date?
I think it Albus might tell Harry something about Lily. Which could be the reason why Voldemort was willing to overlook her that Halloween night. Regardless of the fact that she is a mudblood. What that might be, I'm not exactly sure....
But many of you here are really good theory-concocters. What do you think?