>First off don't give away the refer-me before you get a referal.I used to think this too, but what happens in practice is that if
you try to offer an incentive, people enter garbage just to get
the freebie, so you end up with a mailbox full of bounced messages.
I set it up specially so that the webmaster would get the
undeliverables because I was sick of them clogging up my own mail
system :)
The moral: the only "incentive" you should give the user to recommend
your site is by having a good site to recommend in the first place.