Last week I showed how to Selectively Blur an area of your photo using Adobe Photoshop CS 6 Beta, but did you know you can do this in past versions of Photoshop very easily, and with even more control? It is pretty simple actually and uses many techniques you already know, such as the Gaussian Blur Filter and Masks. However, the combination of the two in a creative way is one of my all time favorite tricks in my Post Processing arsenal. There are unlimited options with this tip here.
[important] Spoiler Alert
You will learn something in this tutorial, if you have something against that then by all means do not continue. [/important]