Videoconferencing is a tool for communication as well as for education. Like any tool, its possible uses are limitless -- however, most of the in-school uses fall into one of the following categories. Maybe you will get a good idea from one of these:

• Combining Resources
  Let's say you have only a couple of students who want a course in Swahili. But, perhaps a distant school has another student, and a third school has yet a few more. Perhaps the course can be conducted with one teacher at one site, with no travel costs.
• Reaching Distant Resources
  Perhaps a museum in Boston or an environmentalist in Alaska would be willing to share knowledge with your students. It could be a for-credit activity, or a virtual field trip. (Note: This kind of resource is sometimes referred to as a "program" if it is offered on a regular basis. Programs can be very interactive and engaging, but they often require payment.)
• Enabling Student Communication
  Students often form clubs or other special interest groups. Why not allow students with the same interests from different schools to "meet" and learn via videoconference?