A Google Alert is a great service Google provides which can keep you informed about any topic you choose. I have my name and “Astonish Results” as keywords. Any time these keywords exist on a website, in the news or in a blog, Google sends me an “alert” in the form of an email.
To get started go to http://www.google.com/alerts and enter your search term (keyword) and your email. Google will begin delivering these alerts the next day.
This a great tool for SEO to see if your site is getting indexed for certain keyword terms or for reputation management (see what others are saying about you).