I finished the 6th book last night and well... you'll see.
First off, I loathe Snape now. He was so merciless with Dumbledore at the end. He was pleading with Snape and he just killed him... also about this, some people think he might've been under the Imperius curse or saving him from a worse death. I am quite torn on the matter; Half of me thinks that was pure evil Snape but the other half wonders how he could do that after all Dumbledore had done for him.
I was amazed at how many more relationships were in this book. It hadn't been much of a focus before but people seemed to snog all over the place this time.
The Ginny/Harry thing made me laugh because my mom had predicted it around the 4th book or so... and I absolutely hated Lavender/Ron. I sincerely hope Ron was just playing around because he goes so much better with Hermione.
My new favorite pairing is Lupin/Tonks. It's the most unexpected thing... I just had to read that part over and over again in the hospital wing. Ah, love.
Horcruxes are too cool. Well the idea is anyway. It explains an absurd amount... why Voldemort didn't die for instance.
R.A.B.- I can only assume that it's Regulus. But did he end up destroying the locket horcrux? So it doesn't really matter much WHO did it as long as it was done...
And I would suppose that his Death Eaters would know about the horcruxes and so Regulus would fit the best.
Well those are some of my ramblings anyway... please feel free to share your opinion! :)