This is the link I used to see if I would get the bonus - it is from the ato page so would think it should be reliable - you need 07/08 tax return to fill in a small questionaire and it then tells you if you should get the bonus or not.
http://calculators.ato.gov.au/scripts/axos/axos.asp?CONTEXT=&KBS=ESB.xr4&go=ok