"Google Australia is celebrating Australia Day 2007 by photographing Sydney Harbour from the air, and we want to make sure as many of us as possible squeeze into the picture."
Next Friday, an aircraft hired by Google will be doing a series of low-level swoops over parts of Sydney, photographing the ground and waters below. And they ask you to take part.
"So when you see the Google branded plane flying overhead this January 26th, hoist a sign, arrange your family into a fun formation or just get a bunch of friends together to wave."
Additionally Microsoft does a flyover over Centennial Park to create a coloured map of Australia of the attending people.