One of the best ways to find out what’s happening on blogs related to your area of interest is to go to Google Reader.
You can put in key words or specific sites. “Google Reader constantly checks your favorite news sites and blogs for new content. Whether a site updates daily or monthly, you can be sure that you won’t miss a thing.”
Each day when I check, I find out which terms or sites have new content. I click on the new ones and get a list of topics with a sentence or two about the content. I can then click on the arrow to go to that site and see if there is something there I want to comment on.