Long Copy vs. Short Copy
Long Copy vs. Short Copy (Signal vs. Noise): "MarketingExperiments.com recently set out to see what impact the length of sales copy has on a website%u2019s conversion rate. The results: long copy clearly outperformed short copy in all three of their tests.
This is something we've wrestled with at BasecampHQ.com. We like to be as descriptive and informative as possible. But there's a downside to this approach. Many visitors are intimidated by large blocks of text and just tune out the site and the tool when they see long copy. We've heard from some visitors that a large amount of copy can make the tool itself seem complex (i.e. if it takes this much text to explain it, can it really be simple?)."
This is the kind of thing you should be able to test side by side - deliver half of your audience a long version, half a short one and see which one performs better.