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@Momentum
For a slightly more controllable bend than dogs' way then get a long bit of tough wood (I used a broom handle on a cheap frame, higher quality steel might need more leverage) and thread it from the outside of the dropout, through one side of the rear triangle and then brace the end on the seat tube. I can't tell whether this makes any sense, but it's dead obvious when you think that the idea is to lever off the seat tube to push the dropout inwards. It's also the same as what sheldon explains, just pushing in not out.
Get someone to hold tight on the frame and lever it in a bit. Keep measuring the dropout spacing and push one side in by 5mm, then the other side. Once this is done then the dropouts won't be quite parallel so use a vice/big pair of mole grips/fat adjustable etc to tweak them out a little so that they're parallel. Then use the string method to make sure everthing is straight and symmetrical, slot your wheel in and ride off into the sunset!