It seems to me that the increased communication capacities when using audio and video, as well as sharing links and screenshots make Skype one of the best free web applications to improve student access to teachers and their learning.
Mr. Yunus was in the introduction of this Google Europe session. There is a speech by Hans Rosling where he discusses statistics in an interesting, enticing way to draw his students and the public into the conversation of the rest of the world...who live in squalor and poverty.
"new online project will let you 'pin' historic photos to images on Google Streetview giving you a snapshot of that particular location throughout history. "