An online Party Planning Website. Basic functions are to plan and send out invitations, etc. This could be a great source for teachers. This could be used to plan a school function, event, field trip, class project, group meetings, club meetings, fundraisers, rallys, parent nights, etc.
This is a free website where high school and college students can sign up and use this to keep up with their assignments and when they are due. With each assignment you can manage tasks, save notes and attach files.
Similar to MindMeister, this free Web 2.0 application allows users to construct concept maps, save, and share them with friends. It's really helpful when organizing your thoughts for an essay/paper or when studying.