A quick aside – if you don’t understand CC licensing, you should review the license explanations before you start using other people’s work on the Web, and if you are a teacher, you should ensure that students understand copyright and copyleft.
In my comment to Scott, I noted that there is another organisation, The Human Capital Institute, that uses many RSS feeds (including mine) but makes you register for their “service” before you can read a complete post. Some might think that this too would contravene the copyright license that I use. Here are two other CC-licensed sites I noticed from the same website:
I also noted that many blogs do not have clear copyright statements, like The Learning Circuits Blog, which means that they are fully copyrighted, so that taking an entire feed would likely infringe copyright. If you have a blog or website and want to share, then you should use something as simple and easy as a Creative Commons license. However, it obviously doesn’t mean that everyone will play by the rules.
Update: Following my notification of copyright infringement to the Human Capital Institute, they promptly deleted my feed from their resource list.