Someone on the codes board reported getting an email pin for around Easter time. I'm not sure it was during Easter week.
Personally I belive Disney is getting away from general public codes and instead are targeting individuals. I also believe that if you show an interest in Disney, they will try to entice you with those email pins. So, if you want one it helps to subscribe, sign up, buy all things Disney. Request a vacation planning dvd from disneyworld.com. If you buy from disneyshopping.com, register with all disney websites.
I pretty much get every offer that comes out (although haven't gotten that '08 one - yet) and I hate to say it because I'll probably jinx my luck but I feel that Disney knows that if they give me a deal, I'm there. I guess it also helps to actually use the deals when they send them to you. They know they've got me hooked!