For what it's worth, for the last 2 1/2 to 3 years, I have received every single PIN code offering that's been discussed on these boards. All have been via email - and several of them were also received by regular mail after receiving them by email.
Last trip taken was in September 2008. Stayed at POFQ, with Free Dining.
I am signed up on Disneyworld.com, receive the monthly Disney Destinations email newsletter and the weekly Disney Insider newsletter. The last two trips I took were booked through Disneyworld.com (Room and tickets - airfare was booked seperately).