To all those who see some kind of secret double-reverse, drop-kick the ball for the first time in fifty years play by Sarah Palin to get her on the Presidential ticket in 2012, all I can say is - no.
She quit her office. Her reasoning is as incoherent as ever. She has not risen to any occasion, but face-planted herself on national television. While it is true the Republican base loves her as only a parent can love an ugly child, the rest of America, given the opportunity to meet her last fall, ran as quickly as possible (so all the encomiums about "real Americans" finding a spokesperson in soon-to-be-former-Gov. Palin are just wrong; real Americans find her frightening). While I do so hope she tries to prepare herself for a Presidential big in three years, it will only be a comedic distraction. All any opposition candidate will have to say is, "Former Gov. Palin, who's to say you won't quit if the job gets too tough?" The fact that Bill Kristol is backing her is all anyone needs to know about her chances.
She's a quitter. Good riddance.