Jakob Nielsen explains the different benefits that Short versus Long articles bring to your site, especially if you are running an online business. In his newsletter, he asks “should your website have concise or in-depth content?”

His conclusion is that:

a) If you want many readers, offer short content. This is ideal for advertising-driven sites or sites that sell impulse buys.

b) If your readers need a solution, offer comprehensive coverage. This is more suitable for solutions to complicated problems.

He recommends writing articles instead of blog postings as people who “really need something are the highest-value users because they’re more likely to turn into paying customers.”

Read more at: http://www.useit.com/alertbox/content-strategy.html