Fill out the survey for a $20 voucher to zuji.com.au.
I've done a quick comparison of Zuji's hotel prices to the competitors and they seem to be the same.
e.g. Hotel Intercontinental Melbourne Aug 10/11
Hotelscombined - $288
Zuji-$288
By filling out the survey you are also entering in their competition to win a $500 voucher. You need to use your $20 voucher by August 31. The only restriction on this voucher is that it can only be used for hotels (no flights). You won't get your voucher until after July 27. Entrants agree to receive special travel offers from ZUJI Australia so may not want to use your real email or simply unsubscribe to their newsletter.
Moneybackco gets you another 6% back.
Via [Donkey on Buckscoop]
Note this includes a '25 words or less' for the entry, though that doesn't affect whether you get the $20 voucher (just whether you win the $500)