I'd say one of my favourite bits was when Ron came back. Turned the story around. Also when Harry saw the nice side to Snape and that he loved his mother. I knew it was comin but I still loved that Harry got to see it like that.
Gotta say, I was soooooo happy when Bellatrix died but woulda preferred it if Lupin had finished her off. He was cut up about Sirius and that woulda been fittin if he coulda had his revenge. I HATED her.