Jolene from Flight Centre phoned - San Francisco hotel Chancellor now booked.

Visas sorted: you don't need one for Singapore; we've got eVisitors for Australia; and for USA we're eligible under their Visa waiver scheme (had to promise not to overthrow the government though).

I think the only bureaucratic thing left to do now is to get an international driving permit, and you can only do that within three months of leaving the country, so nothing to do for a while....