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Here is the heat diffuser I ordered:
http://www.amazon.com/gp/product/B0001ZI01A
It says that it is for gas and electric stoves. I shopped around until I found one that claimed to work on electric stoves. Decent reviews too.

Let me clarify on what I mean by ON and OFF in terms of the electric stove heating elements. I too grew up with the standard heating coils that graced all electric stoves back in the day and even many today. Those stoves - as well as the glass top stoves - do have temperature controls that generally range from LOW to HIGH with complete variability in between. The difference though is that the old coiled elements had a varying amount of electricity running through them whereas some of the new glass top stove elements do not. In the old coiled elements you could put it on LOW and the element would not glow, because there was not much electricity flowing through it. It would still be warm, but not to the point of glowing. Turn it up little by little and you will notice that it starts to glow a little bit. Turn it up to HIGH and you see it glowing brightly. You basically throttled the old coiled elements much like you throttle your sink faucett to either flow a little water or a lot of water. Some of the new glass top stoves do not give you this throttling capability per se. You can put a new stove on LOW and you will see the element through the glass glow orange, but it will not stay glowing for very long. It will cycle on and off as required to keep the burner at a low temperature. Each time it cycles on it is flowing maximum electricity. Turn it up to HIGH and it will still glow orange, but it will stay orange for a longer amount of time. It will still cycle on and off, but it will stay glowing longer in the HIGH position than it will in the LOW position. Again using the sink analogy - imagine your faucett valve having only one position and that position being fully on for maximum water flow. You can manually open then close the sink valve at a slow rate or a fast rate. Each time you do it you are flowing the same amount of water at a given instant, but you are varying how long you keep the water flowing. So to put together the final analogy an old style coiled element stove operates much like your sink faucett. You can barely open the faucett and trickle the water out or you can open it all the way and have it come out forcefully. This is how your old coiled element stove works.

In order to maintain a particular temperature you have to vary something. In the old stoves they simply varied the amount of electricity going through the elements. In some of the new glass top stoves they leave the flow rate of electricity constant, but vary the amount of time that electricity flows through the elements. Perhaps a better example would be a dimmer switch on a ceiling light where you "throttle" the amount of electricity going to the light. You can turn a light bulb on and off with the light switch or you can use a dimmer switch and vary the amount of electricity going through it.

So in the end you have two different ways to maintain temperature. In some cases this can affect the way you cook some things.

You are correct. I went back to Amazon and saw that feedback someone left about it being only for coil type electric stoves. I then called Nordicware (the vendor that makes the heat diffuser) and they too confirmed it. They admit that they should be more specific in their product description, but not sure they are going to change it. I received it via UPS yesterday and nothing in the associated paperwork differentiates between the different type of electric stoves. In any case I will send it back and more than likely take the restocking fee hit.

I looked at the owner's manual for my glass top stove and it does not mention anything whatsoever about pressure cookers or heat diffusers.

Well chalk this one up as a lesson's learned. I went to the Post Office to return the flame tamer's (heat diffusers). I bought them through Amazon and the retailer was in Canada. I was stunned when the postage to ship them back to Canada was a whopping $24.25. Yes it was Priority Mail, but I did not know it would be anywhere near that expensive. So by the time it is all said and done (including the 20% restocking fee) this has not been the most economical endeavor I have undertaken.