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various research studies which show that whilst serifed fonts provide 
better readability on paper, sans-serif is more readable on screen.
In addition, typefances with metrics that depart considerably from the norm 
(such as verdana) are best avoided. (My personal favourite is Trebuchet, 
which I use for nearly everything).

Perhaps the best solution is that font-family preference should be left 
entirely to the user?
-- 
Richard Grevers