I know this is a lot to ask for considering this script is free and you are not making any money from this.
I was wondering though if there is a possibility to remember users from previous sweepstakes, maybe by email. This would make inviting friends a lot more attractive to users, if they know they can keep their extra entries for ever .
Most contest of course rely on users inviting new members for every different contest in my case it is important to remember users and keep them happy by not deleting their extra entries they have earned once a contest is over.
I hope you can understand what I am looking for here, nit sure if I'm actually explaining it right.