This article from Europolis shows that debate can change people's opinions.
One concern about the efficacy of Interactive Democracy, or any system of referenda, is that people vote withot much thought and without debating the issues. By requiring that people "pass through" the debating part of the ID web site in order to vote, encourages them to consider the points raised by others. I would also like the state media to show TV and radio debates on each issue. These may include a panel of none political experts.
(Thanks to Amanda at World Leader Proposal for the link)