Just use the code FB50 when signing up to any new policy from HIF. It's just recently been re-activated this morning. There will be a coupon box you enter this into when signing up. This will let HIF know to send you a $50 EFTPOS card in the mail along with your shiny new solid plastic membership card.
I've been with HIF since February (for hospital) and for probably a year prior to that for extras. I get roughly 40% back on all my chiropractic and dental bills for only $180 a year!
The customer service is absolutely second to none. They are a little busy but only because they have extremely well trained staff and are one of the best, they also had the lowest price increase this year out of all the funds so people are flocking to them! They are completely not-for-profit (no shareholders) so everything goes back to the members with cash reserves to ensure they can payout on claims.
I don't usually post deals so please excuse me if I've forgotten something!
Don't forget HIF's referral rewards (which I'm assuming this would stack with): quote an existing member's name and membership number when signing up, and they get a $70 EFTPOS card as referral reward.
There's a list of OzBargain members who are happy to refer you (and maybe share the reward) here.