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More about Bokeh...
Bokeh really isn't about the far-out-of-focus regions of an image. Everything is pretty much smoothly blurred there. Why Bokeh matters is because when portions of an image get further and further out of focus they don't always smoothly blur out (like simply increasing the radius of the Gaussian Blur filter in Photoshop). Instead the image formed by real lenses often show objects "breaking up" with some nasty looking spatial variations in the region of intermediate focus - before fully blurring out in the far OOF region. A lens that's said to have "good bokeh" avoids this tendency and tends to produce a smooth transition from sharp to blurred as the degree of misfocus increases.
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