For what it's worth, all the number formats defined for various locales installed with the Sun 1.4 java SDK produce four basic formats, which have already been mentioned:
1.234.567,89 - Many European countries.
1,234,567.89 - The rest of the world not listed below.
1'234'567.89 - Switzerland
1 234 567,89 - Sweden, Yugoslavia, Slovakia, Russia, Poland, Norway, Latvia, Hungary, Luxembourg, France, Canada, Finland, Estonia, Czech Republic, Bulgaria, Belarus
Thanks for this, I have only lived in the UK and Australia for long periods of time so have never came across this. Interesting.