One of my favorite products from Google is Google Alerts.
Once you decide what word or phrase you want to track (and using Google’s Advanced Search feature, you can narrow your searches), you have a lot of options. Do you want to search all the internet, or just blogs (or other areas)? How often do you want to be updated? How many results in each email? Maybe you would rather have it as a RSS feed in your Feed Reader?
This is a great way to track mentions about you and your company, keywords in your field, as well as people in your field.
You do have to have a Google account (you mean you don’t have one?) but it is an easy way to keep up.