@Brandon9000,
This aspect of the selection, the potential for attracting Hillary supporters, is obvious, but it is not the only basis for the choice.
Palin is a solid conservative and, I'm sure it is hoped, will excite the conservative base of the Republican party.
She is also, clearly, a Washington outsider who bolsters McCain image as a maverick and reformist, while Obama (he of the New Politics) chose one of the quintessential Washington insiders, Joe Biden.
She doesn't have an embarrassing record of critcizing McCain and praising Obama, and she's as frank and tough as Biden. Undoubtedly when she debates Biden he will attempt to paint her as an inexperienced novice (a wise approach) but he has been wrong about enough international issues to be shown up as experienced in pontificating but not necessary in making decision (or at least the correct ones). It is certainly possible for her to win a debate with Biden. Whether she will or not remains to be seen.
We are certain to hear more about the investigation in Alaska concerning her firing her brother-in-law. I admit I'm not fully up to speed on the facts, but it appears that if she did abuse her power as governor it was to get even with a wife-beater -- not exactly red meat.
She is an extremely interesting choice, not the least of all because she is anything but the sort of professional politician with the unbound ambitions and ego of Obama, Biden and McCain.
It certainly seems that if Democrats can dismiss the inexperience of Obama in favor of his perceived "freshness" and promise the same forgiveness should be applied to Palin, and if we have to take a chance on an inexperienced, but decent and exhuberant newcomer, doesn't it make sense to do so with one who is running for the apprentice's position, and not that of the master?