Mary Harrsch says that RSS is the killer app for education. Here’s one of many examples she gives on how it can be used:
You are a teacher looking for content that can be used in the study of the Spanish conquest. You find a Web site that has excellent biographies of the cultural leaders, profiles of the different native cultures, and even some patterns for ceremonial masks that can be reproduced for a class activity. In the past, you would have e-mailed a few colleagues about the site and your plan to incorporate some of its materials into your curriculum. Now you post the URL and your ideas for implementation to a weblog equipped with RSS generation capability. Other teachers like you who are looking for ways to improve their learning environments–including student teachers in colleges of education around the world–can easily “subscribe” to your news feed and learn from your unique professional experiences. In essence, you have established extensive online community of practice specific to teachers of social studies.
We all have unique experiences and solutions that can benefit others. No rule states that only professional textbook publishers should be allowed to create curriculum materials or suggest how to use them.