Danish mag Gamereactor: 'In cooperation with NFI we acquired 50 codes for the current beta, and you're able to get one if you send us an email at:
Remember to write "Little Big Planet" in the subject field, and remember it's very limitied.'
(It's not neccesary to create an user.)
Unlike miserly NFI/Gamereactor DK, Gamereactor Finland apperantly has 150 more keys. Check this link: http://translate.google.com/translate?u=http%3A%2F%2Fwww.gamereactor.fi%2Fkilpailu%2F%3Fid%3D15&hl=en&ie=UTF-8&sl=fi&tl=en (like the Swedish and Norwegian sites you need a user)
Denmark got 150 more codes. But hurry up!