Charles Yeager covers the different ways you can achieve the Bokeh effect including using the Crossphere Bokeh plugin in After Effects.

Nice audio visualizer using Stardust and Crossphere Bokeh by friedpixels aka James Ramirez 

French language tutorial on how to create a green-screen composite using Crossphere Bokeh to get nice realistic camera background blur.

Learn how to use Crossphere Bokeh and Separate RGB to add a beautiful depth of field effect to Element 3D renders