I have to admit that I am quite of a noob to this bokeh thing and didn't know the existence of it until after I have got my first dslr lol and lately I have started to pay more attention to it and actually tried to create it in some of my photos but I know that my knowledge is still very limited so I decided to try to find a good tutorial about it earlier and this is what I found:
http://www.booleansplit.com/?p=39It's a great article BUT it's also a lil bit confusing and you may need to read certain parts more than twice to fully understand it.
For those of you who are too lazy to read any kind of tutorials or guides here is a few excerpts from that tutorial I find useful and interesting:
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shooting bokeh is one of the easiest photographic techniques to learn. Unfortunately, it is also one of the hardest to master.
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The secret to shooting bokeh lies in its definition: out of focus highlights. You need three things to shoot bokeh: pin point highlights, a large aperture and a short focal distance.
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That is not to say that one can not get great bokeh using lenses with a smaller maximum aperture like the typical kit lenses sold with most entry level DSLRs. The trick is to make sure you are using the largest aperture possible (smallest f number).
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The focal length of the lens is also a consideration. Depth of field is basically a function of focal length, distance to subject and aperture. At a given aperture and distance longer focal lengths result in shorter DOF. A short DOF is what we need to effectively blur the background highlights to produce bokeh. Getting close to the foreground subject and zooming to the longest setting on your lens will likely put you where you need to be to capture killer bokeh.