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I believe this has to do with the fact that the window is not fixed to the top like on a sedan or coupe, as such there is more flex in the convertible body, and it is easier for the roof to "slide" against the window than it is for the whole thing to flex.
To test: Take your car to a decline, or inclined driveway, and attack the incline at an angle such that one front wheel meets the incline first. This will cause one half of the front of your car to experience an upwards force, putting strain on the window/roof joint. If it makes a noise, you know that is the culprit.
Note that I find that my car will only do this when its cold in the morning. When I come home after a trip (after it has been jostled around a bit) it doesnt make any noise.
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