Welcome to the community spookymark. Hope you enjoy your stay. [excited]
That effect is exactly the same as the method used for the glass button tutorials you've no doubt seen around. The only difference is the shape it's being applied to.
To create that shape, do the following. Then after you've made the shape, simply apply the same steps to it from one of the tutorials you've seen on making glass buttons.
1) Create a rectangular selection the size you want the viewscreen to be.
2) Press 'Q' for the Quick Mask mode. Gaussian blur by 5 pixels.
3) Press 'Ctrl+L' to open Levels. Drag the left and right sliders toward the middle. Watch the mask shape become more sharp around the edges. When the edges are nice and clean looking again, press OK. Then press the 'Q' key again to exit Quick Mask mode.
4) Now add a New Layer to your document, and fill the selection with a Linear gradient, using the colours of your choice. Just make sure the darker colour is at the top.
5) Under the EDIT menu choose Transform/Perspective. Grab one of the bottom corner control points and drag it inward until the shape appears the size you want it. (the angle is about 37 degrees) Press the ENTER key to apply the transform.
Seems like a bit of work, but once you know the routine, it takes less than a minute to do this.
