Use Google Reader to share content from RSS feeds with your students. This is good in any type of course, and would be especially useful in courses where current events are discussed. Once the RSS feeds are set up, all you have to do is check the content on them, and share the ones you want your students to see. You can update content very fast and easily. I use this for my Photoshop class, where I subscribe to free online tutorials, and then share the ones that fit what we are doing in class at that time. It only takes a few minutes each week, and provides huge amounts of new content to students. Click on the following link to download a .pdf tutorial on how to set this up.