I'll write something more detailed later, but my verdict on the debate would be that Cameron and Brown really raised their games, with Clegg still performing strongly, but not as strongly as last week. I think the YouGov/Sun instant poll got it about right but I'd put Brown slightly ahead of Clegg and Cameron just inching it.
And please don't anyone accuse me of seeing it through blue tinted spectacles. I called it for Clegg last week, I defended Clegg this morning, so I don't need to prove I can look at these things impartially. If I thought Clegg had won I'd say so. I thought he talked too quickly, he gabbled and was at times all over the place. However, his closing statement was the best of the three.