Here is a quick screencast to show you how easy it is to create lists on Twitter. Lists can help organize twitter users by criteria you choose so that you can narrow or focus your reading from time to time, rather than just using your timeline view. For example in the video you'll see my Admin list which is comprised of over 50 principals and superintendents that are using Twitter regularly. I review this list a few times a week to get a sense of how admins are using Twitter and to see what they are reading and discussing. Since I don't particularly interact with those folks on Twitter I chose to assign them to a list rather than follow each one of them. This frees up my timeline for people that I regularly interact with on Twitter. In addition to assembling your own lists, it is also very easy to "follow" public lists that many of us have already created.
Visit my page if you'd like to see my lists and follow any of them: http://twitter.com/teaching_music