For those of you that may not be familiar with Skype, their website features a series of tutorials that explain and demonstrate the features of Skype. The various videos can be found in a section called Skype essentials.
The link to Skype essentials is here.
Be sure to also explore the features that are available with Skype mobile. In the high school where I currently teach, virtually every student owns a smart phone. I imagine that this will be the main access point to Skype by students and teachers as school districts continue to remove bans on personal electronic devices in classrooms.