'What makes real-time search results different from standard search results is that the most current links are given priority over older links. Real-time search is very helpful for finding information about the latest trends or news in a particular niche.'
Wild Sanctuary is a great resource that allows users to listen to the "sounds of nature" as recorded around the world. Wild Sanctuary offers Google Earth and Google Maps files of placemarks containing audio recordings from around the world. Each placemark features a recording of the sounds of nature (birds, waves, rivers, mammals, etc.) made at that location.
As a teacher, using an RSS reader can help you stay informed and up to date on new information related to your content area and practice. People often ask me how I find so much information about new technology resources, the answer is simple, I scan roughly 600 updates in my RSS reader every day. Obviously you don't have to subscribe to as many websites as I do to stay informed, but my RSS addiction does demonstrate how much time a person can save and how much information a person can find by using an RSS reader. If I didn't use an RSS reader there is no way that I could find so much information in a couple of hours each day. (As a side note, I'm going camping for six days without Internet access when I get back, I'll have thousands of items to scan through).
If you maintain a blog or website for your classroom, having your students use RSS readers is a good way to keep them informed of new information you've posted. For teachers that address current events in their curriculum, having students use RSS readers is a good way for them to track developments in news stories.
Teaching web search strategies early in the semester can prevent frustration for you and your students down the road. The Boolify Project mentioned above is suitable for students in elementary school through high school. The Primer in Boolean logic is probably best suited to high school and college students.
Zigtag's group option could be useful for creating professional learning networks. The group option could also be useful for students that are working in groups on research projects.