Google Alerts is a great tool for tracking your name online, tracking work you’ve posted online, and tracking the topics in you have an interest. You can create a Google Alert for any search term(s) you like. Once you’ve established an alert, you can choose to have Google send you an email anytime your chosen terms appear online. Alternatively, you can choose to have your alerts delivered to your Google Reader account.
http://www.freetech4teachers.com/2010/03/how-to-track-topics-with-google-alerts.html