One of those silly who-should-you-vote-for thingies:
http://london.votematch.co.uk/
I got:
1. Livingstone
2. Paddick
3. Berry
4. German
5. Craig
6. O'Connor
7. McKenzie
8. Johnson
9. Batten
10. Barnbrook I got:
Ken Livingstone (Labour)
Siân Berry (Green Party)
Lindsey German (Left List)
Brian Paddick (Liberal Democrats)
Matt O'Connor (English Democrats)
Alan Craig (Christian Peoples Alliance / Christian Party)
Boris Johnson (Conservatives)
Winston Mckenzie
Gerrard Batten (UKIP)
Richard Barnbrook (BNP)
and
The Labour Party
Green Party
Unity for Peace and Socialism
Left List
Respect (George Galloway)
Liberal Democrats
English Democrats
Abolish the Congestion Charge
The Christian Choice
Conservative Party
UK Independence Party
One London (Leader Damian Hockney)
British National Party
...although it's actually a tie for second, and what's quite probably the minimum possible difference between those and first place. Another tie between ED and Abolish Sanity.