Kidblog.org is designed for elementary and middle school teachers who want to provide each student with their own, unique blog. Kidblog's simple, yet powerful tools allow students to publish posts and participate in discussions within a secure classroom blogging community.Teachers maintain complete control over student blogs.
VERY cool idea.
A website that allows you to create questions that people can answer with a video of them answering your questions.
Cool possibilities for integration in a classroom
This allows you to annotate comments on YouTube videos and to show only portions of the videos that you select.
This could have some powerful options that focus a students attention on just what you want them to see and to think about.