The hugely popular bid back madness is back at HappyBidDay! It is only for a week, from August 17th to 23rd. During this time, every single bid that you place in an auction will be returned to you as a Happy Bid, which can then be used on any happy auction. This is a great rewards program where your chances of winning are literally doubled. Even personally I've had great success with their bid back madness (pity it doesn't last forever!) You get the bids in your account as soon as the auction gets over.
Anyway, if you are interested, check out HappyBidDay. If you are not yet a member, you can Register Here (coupon included) to get 20% off your first bid pack purchase, which is a great saving.