Great site for making mind maps and doing online brainstorming. Able to be exported and shared with others. Great tool for teacher collaborators and for kids! Super easy to use
PresentationTube Recorder is a tool designed to record Ppts for 15 minutes--free, of course, though there is a paid version that allow more to be done. Worth a look
With this tool, you can take a portion of a YouTube video, add your own materials and then use for teaching. [So those of you working in schools with YouTube blocked, this is a great work around.]