This website looks like a great resource for those teachers/classes looking to collaborate globally with classes/people on certain topics. When you create a profile on the site, you specify how you are interested in using Skype with your class, and then from there you can search for classes/people with similar interests to organise a video conference.
A great site for teachers explaining David Hyerle's Thinking Maps (8 only); has great video clip too!Thinking tools are graphic organisers that enable students to engage in independent thinking and learning.
Exploratree is a great site for educators to use for creating mind maps or brainstorming. This is an easy site to use that allows for group collaboration and comments as well. Best of all, Exploratree has a number of different templates to choose from to find the right "mind map" for you.