June 20, 2008 -- Web sites like TeacherTube.com let educators post instructional videos and share thoughts and lesson plans with colleagues across the globe in a format similar to YouTube. Other Web communities -- HotChalk.com is one dedicated to K-12 education -- let teachers correspond with students and teachers, keep track of coursework and create class Web sites. Some let students e-mail assignments to their teachers from off-campus locations and let parents log in to check on grades and download extra-curricular activities. More...