In the piece to which Peter links below, David Brooks writes:
And what was most impressive was her speech’s freshness. Her words flowed directly from her life experience, her poise and mannerisms from her town and its conversations. She left behind most of the standard tropes of Republican rhetoric (compare her text to the others) and skated over abortion and the social issues. There wasn’t even any tired, old Reagan nostalgia.
And here’s Peggy Noonan in today’s Wall Street Journal:
Which gets me to the most important element of the speech, and that is the startlingness of the content. It was not modern conservatism, or split the difference Conservative-ish-ism. It was not a conservatism that assumes the America of 2008 is very different from the America of 1980.
It was the old-time conservatism. Government is too big, Obama will "grow it", Congress spends too much and he’ll spend "more." It was for low taxes, for small business, for the private sector, for less regulation, for governing with "a servant’s heart"; it was pro-small town values, and implicitly but strongly pro-life.
This was so old it seemed new, and startling. The speech was, in its way, a call so tender it made grown-ups weep on the floor. The things she spoke of were the beating heart of the old America.