Google Alerts and have search results automatically sent to your e-mail. You can see what people are saying about you, your blog, your book, or any and all agents you're interested in researching. Whatever search term(s) you'd like to be continually alerted to! Just remember, you have to set up an alert for each seperate search term or phrase that interests you. For example, I have alerts set for Casey McCormick and Literary Rambles and some of the agents I've spotlighted.
Here's the help page if you'd like more information.
And if you'd like to send a research or writing tip in to be featured on Lit Rambles, please e-mail them to agentspotlight(at)gmail(dot)com. Thanks!