[Metrics relating to page length, views of the bottom of pages, and more][link]. These statistics are a kind of pornography to a lot of people I know:
>91% of the page views were long enough to contain scroll-bar. Of those, 76% were scrolled to some extent.
22% of the page views with a scroll-bar were scrolled all the way to the bottom.
[link]: http://blog.clicktale.com/2007/10/05/clicktale-scrolling-research-report-v20-part-1-visibility-and-scroll-reach “ClickTale Blog » ClickTale Scrolling Research Report V2.0 – Part 1: Visibility and Scroll Reach”