From time to time, I see references to the "Fortune 100" or the "Fortune 400." There is no "Fortune 100" or "Fortune 400". There is the Fortune 500 list and the Fortune 1000 list. The proper use is like this: "Procter & Gamble is one of the top 100 companies of the Fortune 500."
(While I'm writing this, a photographer is taking my picture. Why? Watch this blog for details! Update Nov. 10: Andrew Spear was taking pictures for the Wall Street Journal. I was featured, along with seven other people, in a cover story on Oct. 26.)