5. Arianna Huffington (http://www.huffingtonpost.com/)
Whether you're a political junkie or a borderline anarchist, you can't easily escape the Web publishing machine that is Arianna Huffington (born Arianna Stassinopoulos in 1950). Despite sounding as though it would be exclusively about herself--seriously, what else could "The Huffington Post" cover?--Huffington's "HuffPo" Web newspaper has arguably become the leading liberal political Web site (er, excuse us, "media brand") on the Net.
It's also the leading source of gale-force sententiousness, stuffed to the gills with blustery editorial after blustery editorial about every political subject under the sun. Huffington's actual comments appear relatively infrequently on the site--she blogs just a few times a week--but her influence is ubiquitous.
6. Mark Cuban (http://blogmaverick.com)
Lest the humble domain name throw you off, Cuban's ego is even bigger than his supersize bankroll. The man who created Broadcast.com and sold it to Yahoo for billions has fashioned himself as more than just the owner of a playoff-caliber but not quite championship-caliber basketball team (whose name, incidentally, was Mavericks 20 years before he bought it; actor James Garner owned a stake in the expansion team). His blog spans myriad topics in the world of business and technology, and Cuban is altogether full of advice, mostly of value to fellow billionaires.