Go to this website: http://www.google.com/alerts
Using a quick fill form you can create an alert by topic,
by company name, by an individual’s name. So now you can
keep tabs, and I mean literally keep tabs on your sales
prospects, customers, competitors, and even keep tabs on
your company. You can keep tabs on the people and on the
company.
I also suggest creating a Google alert with your own name
to keep tabs on what's being said about you.