You other Vita owners get the referral program email? Buy a vita and register and you get a $20 PSN card. Use someone's referral code and both you and them get $20. Kinda neat.
I don't want to piss people off an post my referral link, but if you want to go through mine so we both get it, just PM me I guess.
Or if you just want to register yourself/check it out, you can go via http://www.urefer.com/sonyvita/
Email came from the Playstation Network, so it seems to be legit. I do know that the input box doesn't work with the amount of digits in the serial, so from another forum I found you can put in a 0 after the first two letters in your serial to fix it.