The protective spell of his mother.
The secret room at the ministry.
Harry rids himself of LV when his heart fills with love.
How this fits in with the ending and twists I'm not sure. But the Beatles were obviously right.

On a side note, I see Harry as the 'Christ figure in the book'.
He is saved by the 'wise trinity' of DD, McGonagal and Hagrid as a baby.
He is beset with temptation (e.g. sorting hat and LV)
He has to come to terms with the fact that he is different from the rest.
He also must come to terms with the fact that in order to save everyone else he may have to sacrifice himself.