Besides Superglu, which didn't have a working link or show up when I typed it in the address bar, Syndic8 was the most confusing to me. I felt like the homepage was too overwhelming and not visually appealing. It took forever to search and what came up was not always relevant.
One useful feed that I found is Free Technology for Teachers. It discusses even more Web 2.0 technology to be used in the classroom. There are pictures and examples of everything discussed so you get more of an idea how to use it at school. Another feed I added to my reader was Classroom Solutions by Scholastic. I use Scholastic to order books and occasionally print worksheets, but never knew there was a blog dedicated to exciting ways to get kids involved in learning! Classroom Solutions is split up into grade level articles, focusing on technology and free events that students can participate in. This is definitely a site I am going to access at school and share with my co-workers!