Awesome Screenshot - no really, that's the name. Use with Explorer, Mozilla or as a Chrome extension. Perfect for all of us non-Mac users. Will be a great tool for blogging!
I've heard a lot about vimeo and think it would be a great resource for the classroom! This of course would be great for students to use to capture student attention, but I could see older children making their own. Especially if you assigned a topic to them where they had to teach the class the topic. I think this seems a bit more student-appropriate since Youtube can be full of craziness. Do you agree? Have you ever had students make one?