What is the best place to look for jobs outside of the UK?

Was thinking about going out to Australia, USA, Canada or Singapore, but would like to know if there was any places I could have for jobs on-line for the mentioned countries.
What is the best place to look for jobs outside of the UK?
You could try Poland, most of the Poles left to work in the UK now employers in Poland are screaming out for workers.
Reply:Switzerland and Germany
Reply:South Africa