37 Signals AB Split Testing
Jason over at Signal vs. Noise is sharing some really interesting data from an copy writing A/B split test.
Writing Decisions: Headline tests on the Highrise signup page.
They basically discovered that short, punchy copy, combined with assurance of a low-cost of adoption spurs more sales. These are things that any copy writer worth their salt knows anyway, but now they have empirical data that proves it.