This technique was used to create the logo of KiwiDesigns.nl. Now I'm gonna learn it to you!
Open up a new image any size and create a black circle.
Create a circular gradient with the colors #EFE69F and #DAC153.
Create a new layer and fill it with black.
Add Filter>Noise>Add Noise and set the slider all the way to the right.
Add Filter>Blur>Radial Blur and set it to zoom and 100%.
Set it to overlay and press CTRL+G.
Merge all layers EXCEPT THE BACKGROUND and delete a circle in the middle.
Select the Move-Tool and duplicate the pinapple-layer.
Now while holding ALT, press down a few times.
Merge the shadow layers and press CTRL+U to darken them and you're done!