Twitter is a social networking site. It can be very beneficial to educators if you follow colleagues and prominent figures in education. Twitter allows you to share articles and resources that are relevant to their interests and education. When you follow people who are in the education you can find lots of new valuable resources that are posted.
Spicynodes is a web 2.0 application that is designed for creating mindmaps. This site is a very interactive way map out information. You are also able to save your mindmaps to your account so that you can come back to them. It reminds me of Prezi with a different twist.
This blog shares information about different resources that teachers can use for free in their classrooms. There are so many free online resources out there and this blog does it's best to bring the best to you.
Google+ is a social networking application that is relatively new and is gaining popularity. A major feature is circles. With circles Google+ allows the user to set friends into circles that have the same grouping such as Work & Teachers.
This site shows you how to create podcasts for your classroom. Some suggestions this site gives for using podcasts are: weekly classroom news broadcast, document a field trip and, record a class discusson.
This wiki is basically a collection of different technology platforms and applications that are common in education and gives you resources about how you can incorporate them into your classroom.
Prezi is a great educational resource for students and teachers alike. Prezi gives a fun new spin on the traditional powerpoint. It also allows you to save your presentation online so you can log on and use it from any internet enabled computer.
ActivInspire software allows you to create flip charts for Promethean boards for free. Seeing as Promethean boards are become common in schools this could be a very useful resource for you to use in your classroom.