GIMP (and also the new version of Scribus, I believe) has an
interesting feature called Display Filters. The filters simulate
several vision problems and different screen settings. This way, the
designer may test if a given color set is going to be easily viewable
in any screen by any person (or sort of...).
Maybe it would be interesting to add a feature like that to Inkscape...
Just by 3 cents :)
Victor Domingos (inkscaping from Braga, Portugal)