What did you offer, and how successful was it? Competitions are a great way to pull in the members - and I will be launching a few soon.
I had great success with a competition I ran quite a while ago on a forum that was specific to this state... I gave away a concert ticket that had been sold out to the person with the most referrals. Worked like a charm.
I gave away 10 sets of a book/dvd and now I am giving away a treadmill with an estimated $400 value. The treadmill one should go over good by the time its done. Doing it on this site www.biggest-loser.net if you want to win a treadmill.