New tools to introduce

I have been looking  for Web 2.0 tools that may be useful for teachers when they return in August and I have found a couple I think may be helpful.
Gapminder is a non-profit venture for development and provision of free software that visualise human development. It was founded by Ola Rosling, Anna Rosling Rönnlund and Hans Rosling on 25 February 2005, in Stockholm. Here is an example, I think this will be beneficial for our high school for students to visualize issues in the world.

Another I have found is Gimp, it is a freely distributed program for photo retouching, and image authoring. It is available for Linuz, Windows and MacOSX. The site offers tutorials by level beginner, intermediate and expert which is nice, and they also have a wiki.
Also check out Gliffy a free concept mapping tool where you work offline and save your concept map as a JPG. You can also share you concept map online with others.
Cute PDF this download allows you to create .pdf files anyone can read with Adobe Acrobat Reader. This is great if your students/parents do not have the software you have at school installed on their home computer such as MS Word.
Visuwords is an online visual dictionary which is very cool.
Kartoo a metasearch engine with a visual display which has been around for a couple of years that I know of. I will be adding more interesting sites and tools as I find them.
Touchgraph, a tool to visualize and interact with information. Enables you to look at data see the big picture and how things are connected. Here is an example of web 2.0

Take a few minutes to look at these links, I think you will enjoy them