If you want a Free Mac Mini or a Free Playstation Portable, then the best way
to get it is not to sign up and harass your friends, but to sign up with a
conga. But those only work well for the first people to sign up — well,
that’s why there are Equal Opportunity Congas. Check out http://macminiconga.tblog.com/ and http://pspconga.tblog.com/ — The person
getting the referrals is randomly selected, so that everyone has an equal
chance to get their free stuff. You’re not left out because you weren’t an
early adopter. I can personally vouch for both of those sites, they’re run
with integrety, if sometimes some broken English.