I have many professional blogs linked on my personal delicious site (http://delicious.com/liberrygurl). They are from librarians, libraries, educational technology specialists, and authors. Blogs can be a great tool to get conversations going, but like many Web 2.0 tools, they can be hard to keep up with. There are so many interesting and knowledgeable people out there.
Blog Pulse is an interesting program if you are looking for a specific topic that people are talking about.
Again, I think I need to figure out one location to corral all this information and links into one central location so it doesn't seem like too much.