Dunno, I just went and quickly braved 4chan (I know... I feel so dirty) to see if anyone was linking anything. They had some rapidshare links up (a 1.4 mb and 1.1mb one).
Am grabbing now just to see what they are... I'm curious if there is anymore info on this.
To reset a Yahoo! Mail password, you need the person's birthdate, zip code, and answer to their "secret question". That information is easily accessible for public figures like Palin. Try it sometime with your friend's email/screenname and Facebook; it's quite easy.
Where I work, all webmail is blocked, so the IA department is grateful to Palin for the object lesson supporting the policy.