Best Web 2.0 Tool to Use for Formal Education

I am having a very difficult time deciding which Web 2.0 tool to use for creating a formal educational lesson. I have considered utilizing an Adobe Connect standalone meeting room where participants can enter the room alone or with multiple participants and interact with each other as well as download the necessary files to review and study, and/or using link-outs.

I wonder if Adobe Connect or GoTo Meeting would be acceptable, or possibly even a single web site as a "gathering" place that houses embedded Web 2.0 tools within.  I have also considered Skype because links can be pushed to participants in the messaging area, along with interactive messaging between all participants.

So many choices and so little time!!!  I think I am about to panic!