I spent a little time digging around the AdAge Power 150 and grabbed the OPML and hacked it up and then sorted it in no particular order (I don’t want to play any faves) and here you go! An exceptionally long list of the top marketing, PR, SEO, and advertising blogs.  If you’re interested in following all these cool kids, be sure to learn what an OPML is, how to use it, and then grab the latest OPML from AdAge.