I'm suprised Palin isn't at least 2nd. I don't think she is going to win the nomination, but she is probably more likely than Jindal of Huckabee.
40% of America love Palin. Whether they will still love her in 3 years, I don't know. I like her a lot, but I won't vote for her, because I know, that unless Obama's approval ratings are below 40%, she will lose. I would feel much more comfortable voting for Crist, even though we don't agree on some issues.
Like I said I don't think she will end up winning the nomination, but I still think she is more likely than most potential Republican candidates at this point, many of whom probably won't run at all.