I was bored, so I ran a few numbers. Assuming the iPhone 4 box has the same dimensions as the previous ones (.145m x .085 m x .07m), 600,000 iPhone 4 boxes would... Be 105 times taller than the Burj Khalifa, the tallest building on Earth. Be 9.8 times taller than Mt Everest. Be 7.9 times deeper than the Mariana Trench, the deepest part of the ocean. Reach 0.87 times the way to the edge of space. Fill 13.3 Twenty Foot Equivalent Units (a semi-standard international shipping unit). Fill 4.25 semi-trailers. Any other interesting things you want the numbers compared to?