Ukpollingreport is the must go to site for making sense of events in the run up to the UK general election. They have a swingometer map that allows you to enter the projected percentages for each party. On a map of Great Britain(the map does not appear to have the Northern Ireland constituencies) the constituencies change color based on the party expected win the particular seat. I have spent the better part of the new year entering different percentages to see what seats would change hands.
Anyway, the swingometer map is a great way to waste time on the internet and yes I realize that I expose myself as more of a nerd then previously acknowledged.