Heh, this is very cool. While trawling around for extra links to update my Arthur C Clarke obit post I came across this linked from Boing Boing:

Abyss & Apex : Fourth Quarter 2007: Wikihistory:

International Association of Time Travelers: Members' Forum Subforum: Europe – Twentieth Century – Second World War

Time traveller revert wars over the life of Adolph Hitler. Wonder if any of them are the bloke in the golden suit?

ETA: From the comments, a link to a Sub-press printed scalzi story on a similar theme. Also very cool.