Some of the guys at work recently sent around this youtube video of the Google Liquid Galaxy.
It is a 20% project by Jason Holt, a Google engineer who took 8 LCD screens, added voice recognition and created a global observatory meets planetarium thing and presented it at TED.
If you think about putting one of these in schools and adding the ability to "zoom in" on webcams running in international cities, you have a real means of making geography more than fun, provide a better approach to teaching architecture, and to really connect people. Could really breaking down the stereotypes and prejudices that build up when people have never traveled.
“Travel is fatal to prejudice, bigotry, and narrow-mindedness, and many of our people need it sorely on these accounts. Broad, wholesome, charitable views of men and things cannot be acquired by vegetating in one little corner of the earth all one’s lifetime.”
–Mark Twain, The Innocents Abroad (1869)
Ever the techno-optimist, this is an easy one!
Google Liquid Galaxy live demo at TED