It's no secret that Google, Microsoft, Apple, and Yahoo are always expanding their reaches, slowly but surely adding new products and services into their line-ups. The New York Times's Nick Bilton took a step back and surveyed their empires.

It doesn't come as much of a surprise to see how much these four behemoths overlap, and I doubt anyone will be surprised when these companies continue to fill in this grid in 2010.

Looking at the empty spaces reveals where we might look for these companies to grow. There have been grumblings of a Google music store for a while, and it seems entirely possible that Apple's Tablet will at least in part emphasize its capabilities as a gaming device.

As the companies stretch and grow, some of their endeavors will prove more successful than others, but until then this chart is an interesting reminder of how vast their reaches already are. [New York Times Bits]