I just watched "Election Unspun: What They're Really Thinking" over on Channel 4. It was a great piece of television, full of nice things to take away e.g. pointing out that Michael Howard unconciously sticks his tongue out whenever he's under pressure and reminding us that that is what babies do when they've had enough milk from mum!
But the useful thing was the signs that tell you who has won a particular constituency before the result is announced. His example was Portillo's defeat.
The losers all line up covering their "privates", crossing their hands in front of them, while the victor, feeling no need to protect himself, holds arms behind his back.
Also watch out for John Prescott's "crack a joke and run away" tactic.