Skype is great for person to person communication through the computer. Alot of the students probably already use it or have heard of it. It is a great and cheap way to open the world up to them and allow them to see things that they might not be able to (due to, say, budgetary constraints preventing field trips). Skype could be used for presentations on different careers; the presenters wouldn't need to come to school. For instance, to find out about a job/career in another country, and what its like in a new culture, etc.