Despite rumors to the contrary, they DO exist

... and you absolutely WILL NOT get any if you aren't visible to the Marketing Fairy Godmother.
To get on her scope:
1) Register an email with the WDW official website
2) Fill in the profile information including personalia, prior visits to the parks, favorite parks, etc.
Be sure to OPT IN for marketing emails and information about special offers!!!
3) Order the vacation planning DVD
4) Go to the reservations section and price out a couple of visits using various options, and save them (don't book them)
5) Go back a day or two later and change some of those saved options
6) When you start getting Disney emails (and you will!), click thru and participate in some of the activities (customized maps, resort preview, etc)
7) Sit back, cross your fingers, and wait for the pins to roll in!
It helps if you've been in the last 5 years, but not in the immediately preceeding year, but that's just a generalization and not a hard-and-fast rule. Case in point: I used a pin from last summer to book for last December, and just got a pin for 30% off room only bookings in November 2011, with only Thanksgiving week blocked out. (I also got various other pins including the 20% off all-inclusive package and a 35% off room only for May)
Try it -- the techniques above don't guarantee you'll get a pin, but following them put you on the radar that you're interested and might need a little incentive to book a vacation.
Good luck!