I read Jacob Nielsen‘s AlertBox today titled "How Little Do Users Read?". He showed an interesting study and analysis of time spent on page vs. that showed users spend only 4.4 seconds on a page for each additional 100 words added to the page. If we assume people can read at 200 WPM, the big finding is that for every 100 words you add to a page, you can assume that customers will read 18% of it.
Choose words well, be concise…and I better stop writing to make the point! Or use this blog entry to make the point.