I was just reading a blog post about this very topic at David Scott's blog. He says,
David Meerman Scott: "The analysis I have done around form versus no form has suggested that there is a 50:1 ratio whether people will download or not. For example, if a behind-a-form offer enjoyed 1000 downloads, that same offer would have gotten 50 000 downloads if it were not behind a form. Why not spread your ideas to as many people as possible?"
Does anyone feel this way?