Illuminating Elluminate

I thoroughly enjoyed our tour of Elluminate. There are many features that could be useful for all level of students. At the elementary level I could see using the voice/typing ability to allow students in another school to communicate with my own class. In the past I have had students be email pen pals with students in another state. This would be an awesome next level. To take it further I love the ability to view and share files. A collaborative project with the penpal would work well in a Wiki. Elluminate would again take it to a different level. Being able to communicate and share files would be an awesome combination. The features seem easy to use, and being an administrator would allow a good degree of security. Students would love to use the applause and related features. Instant feedback is awesome. The cost involved might be a roadblock at first. I would like to check out other related free programs. I believe that someone said Elluminate has a 3 person free level. Is that correct?
David