Google offers a service called "Google Alerts" alowing you to monitor what is being posted on the Internet about your company or even yourselft. [more]
Simply go to http://www.google.com/alerts, to Create a Google Alert (see options below):
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Search terms - enter your choice of query or topic
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Type - options include, News, Blogs, Web, Comprehensive, Video, and Groups - in most cases you will want to choose Comprehensive
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How often - options include once a day, as-it-happens, and once a week
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Your email - you will be sent a verification e-mail before you begin receiving alerts
You can also sign up for a Google account and manage your alerts within your account - to sign up for a Google account go to https://www.google.com/accounts/NewAccount
For more information about Google alerts, visit their FAQs at http://www.google.com/support/alerts/bin/static.py?page=faq.html&hl=en