I've been browsing the Skype conversations here, and I thought it might be helpful if I shared a resource. Most of my work is in H323 videoconferencing, but the principles and instructional strategies apply to any type of videoconference.
In particular, here are two sources of ideas to beef up the instructional content of your Skype calls beyond just discussion or Q&A:
* Kid2Kid Videoconference Projects Booklet
, with templates and sample agendas. Just plug in your content!
* Collaborative VCs Wiki
, with lots of teacher designed lessons, complete with preparation information and videoconference agendas.
Hope these are helpful as you use Skype and other synchronous VC tools in your classroom!