The Envy Patrol at the NYT is always on the job: "The top 10% of Americans collected 48.5% of all reported income in 2005."
Since neither wealth nor income are zero sum games (although the NYT tends to make it sound otherwise - as if money were an Easter Egg hunt), I see no reason why anyone should care - other than envy. And besides, the top 10% pays most of the taxes, too, for the benefit of the rest of us.
My feeling is this: If I had the talent, drive, and personality traits to be a Hollywood star, a major league pitcher, a sought-after CEO, a genius investor, a clever entrepreneur, a neurosurgeon, or a Wall Street lawyer - or the luck to be a fortunate heir - I'd get a big kick out of it. But it's not all that bad a thing to be a regular American. In fact, it's the best thing to be on earth.