Paul Allen
founded Internet company MyFamily.com and is now managing partner of business incubator Infobase Ventures. He writes about technology, telecommunications, entrepreneurship, public company investing, venture capital, books - basically anything that he is thinking about. This is a fabulous blog due to the intelligence, presentation and subject matter of the posts. It's particularly useful for those involved in (or investing in) Internet companies. Posts are roughly one per day.

The Peridot Capitalist
was launched in October 2004 by Chad Brand, the founder and president of Peridot Capital Management LLC, an investment advisor based in St. Louis. The blog highlights the contrarian investment strategies that Peridot employs when  managing portfolios for its clients, and contains observations about individual investments and the broad market. Post are often daily, usually at least a few times per week.

Profit Prowler
focuses on short-term trading opportunities in stocks and options, using what the blogger calls "a profitable, proven, contrarian approach of shorting price peakes and buying price bottoms."

The Prudent Investor
is a stock market blog with a firm ideological slant. According to author Toni Straka, "we approach an era of global redistribution of wealth... the US-European centrist approach will not work much longer. Five billion people in the developing countries will demand their fair share of the world's resources." Combined with an adherence to Kondratieff's theory of long market cycles, that produces a focus on "the problems of fiat currencies with their inherent fate to get destroyed by the ruinous dangers of credit-induced inflation". Mr Straka edited the financial section of the Austrian daily paper Der Standard and worked for the Frankfurt bureau of Reuters. He writes in (excellent) English, though occasionally his foreign roots show up in minor grammatical errors. Posts are 1 to 3 per day since the blog started in April 2005.