While six Orange County residents made the new list of Forbes'400 richest Americans, only one—-perennial list-maker Don Bren,chairman of megadeveloper and landowner Irvine Co.—-got wealthythrough real estate. Four of the other five made it in thehigh-tech business, while the last one is an oil heiress.

The new Forbes list illustrates how the economy and perhaps eventhe power structure of Orange County are changing. While realestate scions dominated the list of OC's richest residents just afew years ago, most of the wealth today is concentrated in thehands of those who set up Internet or other types of high-techcompanies here a few years ago and earned a fortune when theirfirms made their initial public offerings.

The two co-founders of Broadcom Corp. and its broadcom.comInternet operations tied for No. 18 on the Forbes 400 list. HenryT. Nicholas III and Henry Samueli are worth $10 billion each, themagazine says.