After a lot of googling I couldn't find any decent Golden Ratio/Spiral plugins for Photoshop, so I made these shapes.
To install just drag the file to the Photoshop icon on the dock and it'll add them to your shape library.
You can flip, resize, rotate the shapes as needed because the golden ratio will always stay the same.
The ratio (1 : 1.6) should only be applied vertically or horizontally, not a combination of both. This image shows how NOT to do it.
This shows how to use it in web design: