Certain skills can get a job offer prior to visa being issued e.g. nurses or doctors, I would have thought that if you can show you have an application in the pipe line then they may offer a job, but going by Lou's and also my experience before I came over most tend to dismiss you right away if you have no visa. On most job adverts they actually have a disclaimer at the bottom stating you must be eligible to live and work in Oz or NZ
I believe the reason nurses and doctors acn have this offer is due to the length of time it actually takes to process the paperwork whereas 'normal' jobs tend to be starting within the month........... so lets all become nurses !!!!!!!!!! lol

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EOI Submitted 10/04/2007
EOI Selected 21/04/2007
ITA Received 20/07/2007
ITA Sent Lodged 31/08/2007
Medicals booked 01/08/2007
Flights booked 22/10/2007
Visa granted 17/10/2007
Arrived in NZ 27/10/2007
http://www.bebo.com/AlanM216