Unlimited: Win a trip to Hamilton Island with you and 19 mates from hotels.com
This would be the ultimate in email harvesting competitions.... to enter you need to first register for the promo, which gets you one entry and then you need to refer at least 9 friends to the promo via facebook, twitter or email and they need to accept the invite to get an entry. You can enter as many times as you like by filling more 'floors' ie dobbing in another 9 mates to the hotels.com email database.....
There's two levels of prize. A daily draw, in which 5 valid entries from the previous day? will win a $50 hotels.com gift voucher.
The main prize is a holiday for 20 of you on Hamilton Island, including flights which must be taken before the 31st of March 2012.