I find it interesting when I find people using the internet in interesting ways. For someone with a professional background in education I find things like Skype interesting.

So I came across this example, by Eric Whitacre. He sent out instructions to talented vocalists, sinc'd up the videos, and viola. Here you have 185 or so singers in a "choir".

YouTube - EricWhitacresVrtlChr's Channel

Simple and impressive.