Martin Eppler presented his research with Alice Comi on inter-organizational knowledge sharing (in the picture below). They found that groups using visual representations are more productive than groups using traditional plain paper. And interactive visualization (= computer-based) is better than paper templates.
Then Nicole Bischof talk focused on clarity and gave practical insights on how to make power-point presentations more clear. tips include having a clear structure and not putting too much text on the slides. The study respondents also reported that misspelling was not an issue, while skipping slides seems to be very irritating for the audience!