A much overlooked issue with px based fonts is that users of IE5/Win and IE6/Win cannot increase/decrease the font size if the style sheet implements them with pixel values.
I recommend going to a relative sizing scheme.
- IE/Win can now increase/decrease text size
- style sheets become easier to maintain when using relative sizing (using em's or %)
As an illustration for relative sizing:
font-family: Verdana, Arial, Helvetica, sans-serif;