Penzu is a great tool to encourage students to do some online journaling and then they can share their entry via email, while, Collaborize Classroom takes students to the next level of thinking a writing! It is a free collaborative education platform for students and teachers.
Teachers recommend Wikispaces, because “it is so ready for students to edit pages and add to discussions as well as embed links, videos, and other web 2.0 creations”.
VoiceThread is considered by many as one of the better Web 2.0 tools that allows users to tell their story and collaborate with others.
There are more web 2.0 Classroom Tools that you may not have heard of. Click to find 100 Best Web 2.0 Classroom Tools Chosen by teachers and students.