Let's wait and see what they come up with for the .org
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This is new to me – Never thought of trying www.google.org before. To be honest, was surprised at this, though it would have just redirected to www.google.com or something like that.
On the website it says “This will be the future site of Google.org – the philanthropic arm of Google.” and “We hope that someday this institution will eclipse Google itself in overall world impact by ambitiously applying innovation and significant resources to the largest of the world's problems.” - So I guess it's just that, and no secret to it (as has been indicated above).