The research
I’m not aware of any research specifically on this point. But given that research indicates taking detailed text off the slides, creating handouts for detailed information makes sense.
Note:
This post is part of a group writing project I ran in 2009. Here are all the contributions:
1. A list of all the blogposts with a one or two sentence summary of each post.
2. A list of all the blogposts with quotes from each post.
3. The e-mail contributions that I received quoted in full. These are from Cliff Atkinson, Guy Kawasaki, Julie Terberg, Michael Alley, Nancy Duarte, Richard Mayer and Seth Godin.