Aaron Wall has an excellent write up named Optimal Word Count & Web Page Copy Length, where he share tips on how to write good content, that is easy to read and "optimized for user experience." Here is the excerpt:
SEO Question: When writing content for our websites what is the optimal copy length? Is page length important for search engine optimization?
Answer: Every page and every site is unique. There is no universal correct or incorrect answer to how much content is right.
A page should not just be optimized for search. It should also be optimized for user experience. If you optimize just for search it could be to the detriment of your business.
One of my friends has most of their content on their home page. Because their homepage has most of the content and the most link equity it gets most of their traffic. They are afraid to move the content because they do not want to lose traffic, but if they moved the content they would probably maintain about the same amount of traffic, drastically improve their conversion rates, and do a better job of filtering the prospective clients.