In January 2011, I assisted 4th grade teacher Amy Huggins in introducing her students to Google Presentations and using it collaboratively. The first presentation below is an example of their work which was done in groups of three.
The second presentation is from an individual assignment this week (late March 2010).
As this assignment was nearing completion, at least one of the 4th graders learned how to embed YouTube video into a slide and that student also tutored others in the new skill you can see demonstrated in the third presentation.
Mrs. Huggins plans to display more of this material online, so watch for it!