Before Unsharp Mask
After Unsharp Mask
You really need to look at larger sized images to see results.
I have learned one of the most important aspects of taking photos with a DSLR, they inherently make soft looking photos. But I've seen pictures that people have taken that look crystal clear. I was always disappointed that my pictures were just a bit less clear. I figured I was just not very good at selecting the aperture or my focus was off a bit or I was jerking a bit when I pushed the shutter button.
Then I read this article Understanding USM started playing with Unsharp Mask in Photoshop and it was like a veil was dropped from my pictures. All of a sudden I too had those Razor Sharp images that I was so envious of.
Go ahead click on the link understand the mystery that is Unsharp Mask and you too will be amazed at the results.