If you want to check out the competition, or scout for new markets, take a look at Business Magazine’s Company Insight Center. It’s in Beta (still being tested), but seems to work well.The site profiles over 300,000 private companies (with varying amounts of information) and more than 40,000 public companies, and you will “find stock quotes and charts, news and press releases, financials and key competitors. Research compensation figures, biographies, and board relationships of key company executives. Read up-to-the-minute global sector and industry news.”

Business Week Company Insight Center

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