A feature of UK elections is the swingometer, sent up wonderfully by the US daily show (9.10 mins in). Trouble is it only works for two parties, since that's all the competition has been about in most recent elections. For this election, suddenly its a 3 horse race between Liberal Democrats, Labour and the Conservatives. At short notice, the BBC have come up with a nice little tool, you drag a pie chart around to see how the percentage of the vote translates into seats in parliament. The map is quite clever, they've translated the constituencies into a pentagon representation which gets over the problem of urban constituencies being very small compared with rural ones.
I have a history of dissing the BBC's maps in twitters and on this blog so good to be able to cheer them on for once.