Here is my category scheme, the picture of which was created using the Visual Understanding Environment. It might seem a bit complicated, but I think this works for my way of thinking. The two main categories of Topic and Use are at the top along with the additional topic of Working. Topic will be specific with each individual link. Use is further specified to four sub-categories: Professional Development, which includes Tools (Open Source and not), Networking, and Research (journal articles, etc.); Resources, such as images, sounds, video, and reading texts; Independent Activities; and Ideas for Lessons. The last two are divided based on my Learning Elements, which I've started to grow used to.