Sure there is. And I know you don't think Voldemort counts, but there is one instance where it is written from Voldemort's point of view. In Deathly Hallows there is this:
But surely if the boy had destroyed any of his Horcruxes, he, Lord Voldemort, would have known, would have felt it? He, the greatest wizard of them all, he, the most powerful, he, the killer of Dumbledore and of how many other worthless, nameless men: how could Lord Voldemort not have known, if he, himself, most important and precious, had been attacked, mutilated?
True, he had not felt it when the diary had been destroyed, but he had thought that was because he had no body to feel, being less than ghost ... no, surely, the rest were safe ... the other Horcruxes must be intact ... But he must know, he must be sure ... He paced the room, kicking aside the goblin’s corpse as he passed, and the pictures blurred and burned in his boiling brain: the lake, the shack, and Hogwarts ....
Deathly Hallows - pages 442-445 - British Hardcover
This scene is actually fairly long and I didn't feel like I should type in the entire text, but it's in the chapter The Final Hiding Place.
In Half-Blood Prince the book opens with the Muggle Prime Minister having a conversation with Cornelius Fudge and his thoughts are revealed.
‘Ah ... Prime Minister,’ said Cornelius Fudge, striding forwards with his hand outstretched. ‘Good to see you again.’
The Prime Minister could not honestly return this compliment, so said nothing at all. He was not remotely pleased to see Fudge, whose occasional appearances, apart from being downright alarming in themselves, generally meant that he was about to hear some very bad news. Furthermore, Fudge was looking distinctly careworn. He was thinner, balder and greyer,
and his face had a crumpled look. The Prime Minister had seen that kind of look in politicians before, and it never boded well.
‘How can I help you?’ he said, shaking Fudge’s hand very briefly and gesturing towards the hardest of the chairs in front of the desk.
‘Difficult to know where to begin,’ muttered Fudge, pulling up the chair, sitting down and placing his green bowler upon his knees. ‘What a week, what a week ...’
‘Had a bad one too, have you?’ asked the Prime Minister stiffly, hoping to convey by this that he had quite enough on his plate already without any extra helpings from Fudge.
Half-Blood Prince - pages 9-10 - British Hardcover
In Philosopher's Stone, portions of the first chapter are from Vernon Dursley's point of view.
As well, there are portions in the books that are from an omniscient narrator's point of view. For example, the introductory portions of the books.
Every time there is a Pensieve scene, we see events from another's point of view.
When Harry was possessed by Nagini, he felt Nagini's anger and instinct to kill which, while basic emotions, still convey opinion and instinct.
ETA: 04.30.12 - I found this in PS:
Hermione had sunk to the floor in fright; Ron pulled out his own wand – not knowing what he was going to do he heard himself cry the first spell that came into his head: ‘Wingardium
Philosopher's Stone - page 130 - UK Hardcover - chapter 10, Hallowe'en