Interesting widget on the Guardian site - Who would you choose for London Mayor?
London mayoral election: who should win? | Politics | guardian.co.uk
The map asks you to choose a candidate and then for your postcode. Whether you're a Londoner or not, it logs where you're from and puts a graphical representation on the map.
For the record, I've put Green. I'm not going to vote for either Johnson or Livingstone come May and the less said about the Lib Dems, the better even if Paddick does seem like a decent sort.