This chart is part of the reason that Amazon's recent quarterly report of earnings is a little off, despite record revenue. These guys are growing their businesses at an enormous rate!
I have a lot of friends working at Amazon now, and my projection is that everyone I know will work there by 2016
Worked at a huge company myself, and hope never to do so again. There seems to be a size beyond which the creation of good software and products becomes improbable.