I have looked at the spectral responses of some typical film and digital sensors. Not surprisingly, the green and red sensitivities are far better separated from the blue curve and the selectivity is better than colour film.
This leads me to conclude that the optimal haze filter for digital could have a far steeper cut-off at shorter wavelengths than what is best for film. This is because the amount of scattering is proportional to the fourth power of one over the wavelength - hence cutting out an extra few percent off the UV end of the blue light curve could be achieved with a sharper filter and this would make a significant difference to the visibility of the haze without upsetting the general colourimetry of the picture.
Question: are there 'special' haze filters available for DSLRs yet?
I think there should be. Any opinions or even experiences?

To the best of my knowledge there are no "special" haze filters for dslr's at this point in time. There are filters with the word "Digital" used as part of the name of a particular brand of filter but this is just advertising hype.

Thanks for the reply; that confirms what I thought.

My supplementary is to ask whether it would be worth while. What do people think, bearing in mind the number of promising shots that are bugged by just too much haze?