I also teach technology and I have used the following site. You can custimize for your progect and save your work. You are encouraged to join but do not have to to use…
That sounds like a great idea and would love to be apart also, we too are in California,Oakland and we love to present this idea to our two third grade class teachers
36-40 students.
With your interest in Web Tools, I recommend you take a look at Wiziq's virtual classroom and authorstream's power point presentation platform. Both are web based platforms, have a bunch of features and free basic service. Here’s a public class recording you might find of interest.