Can anybody tell me about working in America
 

Im from Australia and have heard of a JR licence that allows you to work in America but I don't know what it involves or whether you still need an american passport or not. Can anyone fill me in????

I think there are two issues here.

1) Unless you have a special arrangement you need a visa to work in the US anyway, details can be got from the US embassy web site- you may well have all the info and I'm not trying to teach you to such eggs! it may be subject to a letter of employment.

2) Most US operators want a US license because of the plane registrations, its quite easy to get the conversion from the ICAO commercial, just one exam for the IR, and one for the commercial, followed by a flight test and oral exam. Minimum training requirements prior to test apply- see web site www.faa.co.uk

I think you also need the FAA license before you can be type rated

The pay can be piss poor for FOs even at corporate level.
Good Luck