When entering a new title for Nook publications B&N PubIt has a field for entering the number of pages in the printed version. I believe this helps potential consumers evaluate the cost of the book versus its value. For those of us who self-publish in print (e,g., CreateSpace, as I do) it would be handy to have a similar field when entering new titles for Kindle.
-James D. Quiggle
For the small reader screens word count is the way to go, I put word count on all my books. That way the reader can figure about how many pages there are on their screen. And page numbers just don't work on readers, different size screen and fonts.