Love this bit on A players:

A players write the book and not just read it. They not only have a clear idea how to competently accomplish their functional objectives, but actually lead the organization to innovate and be world class within their functional area. They raise the bar on the entire organization. One way these candidates can be identified during an interview is when they actually teach the interviewer something about how the company can win.

Interesting rule of thumb:

Only hire people you learned something from in the interview.