Wallwisher.com in class

Wallwisher enables you to collaborate on one screen, or wall if you will, and has numerous applications in the classroom. You give out the url (in the format http://www.wallwisher.com/wall/yourtitle where yourtitle is what you have decided to call the page. For example, year2adverbs, or whatever title relates to your work.
Children simply navigate (Year3/4 managed this fine) to the site and enter their sentence/idea/answer to question along with their name, and it immediately gets posted to the wall. Children love the collaborative aspect of it and can see their work appear when the page is refreshed. I introduced it in a staff meeting today and hope to get more staff using it in due course!

Twiddla collaboration

This looks great for collaboration between pupils. I've not used it with a class yet but the possibilities seem many and varied. Rather like Etherpad this extends on the text collaboration to include tools for drawing, graphics, audio and photos. I think posting a picture for children to add descriptive sentences/phrases around the edge could be a starting point to test its worth. Previous use of Etherpad with Year 4 pupils has taught me that each child should be given a pre-determined area of the screen to work in, and that 4-5 children per document is probably enough before it becomes unmanageable!