in his wonderful book "Tog on Software Design" Tog wrote:
"Thumbnails will replace generic-looking document icons, providing users with visual cues as to the nature of the material inside a container. Their appearance will go beyond today's thumbnails to reflect the amount of material they contain." [p. 196]
This is exactly what I like to do for OpenOffice.org/StarOffice thumbnails representing documents. My idea is to code the number of pages as a stack of sheets.
My question is: Does anybody know about papers or studies on this subject?