Keyhole is software that allows you to see a 3D digital model of the entire earth via the Internet. Once you download and install the software, you type in the address you want to look up and it zooms in on it. It’s scary stuff – I tried my home address and there it was, I was looking at a 3d layout of the whole neighborhood with information about it, including some things I didn’t even know. You can customize the view so that you can see the address from different angles or to see what other places are located around it – such as stores, hospitals, parks, streets, etc. Google has purchased Keyhole so it’ll be interesting to see what further direction its taken too. Currently the lite edition has an annual subscription rate of $29.99. There is a free trial available on their site so even if you have no use for this software it’s worth trying out just for kicks.