Most people haven’t got a clue to how many services Google offers. I’ll try to run through some of them below, starting with my favourites (view complete list from Google.com):
Google alerts
Want to stay updated on specific subject, then sign up for Google alerts. A great service I use for 4-5 subject currently. Just make sure you don’t make the subjects to generic. When signed up, you’ll receive email notifications whenever the subjects are found by the Google agent/Google bot. http://www.google.com/alerts