TIDLAS04
TIDLAS04 - 15% off travel insurance at Travel Insurance Direct. (better deal posted by zhenjie, it still works)
http://www.ozbargain.com.au/node/9225
TIDEGG - 10% off travel insurance at Travel Insurance Direct.
TID is backed by Allianz and is consistently the cheapest when buying travel insurance (in my opinion).
For people who are looking at renting cars, instead of paying the excess reduction fee to the car rental companies, it's often cheaper to just get travel insurance, and it covers more as well.
Note: Mod can delete this deal, I edited it so people can get 15% off instead of 10%.
A less beneficial dupe of this one:-
http://www.ozbargain.com.au/node/9225 - 15% off not 10, and I can confirm it still works, as I used it Sunday.