New Document and Fill Background

Make a new canvas any size, mine's 200 x 200px and then fill the background with #5F5F5F

Smoothed Button

Make a new layer and get the Rounded Rectangle Tool with these options make a rounded box about this size

Blending Options

Go into the blending options for the button layer and set these options:
Drop Shadow:

Inner Shadow:

Inner Glow:

Gradient Overlay:

And the result is:

Text etc

I used Tahoma 12pt no Anti Aliasing, color #FFFFFF
and this Drop Shadow:

What can be done: