I want, oh so deeply, to be shocked. But I'm not. Here's the thing: women are powerful! Women are amazing! Women are reaching the upper echelons of corporate America! Hurray! And while I'm sure everyone at NOW threw a soda party when Indra Nooyi took over as CEO of PepsiCo, Inc. (NYSE:PEP), I'm sure they also tried to get mad about today's "news": male executives make way more than female executives. And then I imagine they remembered: this is nothing new. This is nothing surprising.

Women have been making less than men since the dawn of time. And although Oprah and Indra and Meg are so darned powerful, they can hardly sway the enormity of gender history in a few decades of exerting their collective feminine force.

Let's try one reason female CEOs, CFOs and the like make pocket change compared to their male brethren (and no, there seems to be no relation between executive pay and corporate profit, sales, stock performance, or how many pageviews your bio on the corporate homepage got this year): there just aren't as many of them. Naturally that doesn't explain why (for instance) the top-paid female executive, Safra Catz -- president and CFO Oracle Corporation (NASDAQ:ORCL) -- made a sad 36% of what the top-paid male executive made (that's Eugene Isenberg, CEO of Nabors Industries Ltd. (NYSE:NBR), for the record). Catz wasn't even the highest-paid executive at her own company, pulling in about half of what founder and CEO Larry Ellison scored.

Well. That is Larry Ellison after all. His ego has to be worth at least as much as three women executives put together.

My best girlfriend from business school, Jaime, just announced that she was quitting her job as a management consultant and taking a position at PepsiCo in the corporate strategy department. Evidently she's not the only smart, financially savvy woman PepsiCo values; today, the beverage giant announced that current CFO Indra K. Nooyi would be taking over as CEO effective October 1, when current chief Steven Reinemund steps down from the position "to spend more time with his family." He'll be retiring in May, and will continue as Chairman of PepsiCo's board until then.

Indra will join 10 other women currently in the CEO position at Fortune 500 companies (by market capitalization, she'll be the second-most important, behind Patricia Woertz at ADM). Analysts seem to be roundly thrilled, calling Nooyi a "star" (Citigroup's Bonnie Herzog) and marking this promotion as an indication there is "enough to keep Ms. Nooyi interested at Pepsi" (Bank of America's Bryan Spillane).

I see it as no coincidence that a valued friend would move to the company at the same time an obviously brilliant woman takes over the CEO role. This can only mean good things for Pepsi. Investors seem to be cheering, too, and have sent the stock up 57 cents to $63.90 so far today, within pennies of a 52-week (and, in fact, all-time) high.

Sarah Gilbert has a Wharton MBA and worked in investment banking for several years, then at a series of increasingly edgy startups before finding her calling, producing blogs for AOL. She doesn't own stock in Pepsi.