MarketingSherpa has just published some prelimary data on reasearch the conducted with/for KnowledgeStorm. One of the question to users and vendors was for what kind of content you are willing to register respective, you think user would be willing to register:
Copyright by Knowledge Storm, Inc 2007
and as you can see, there is quite a diffence in this answers and untaped opportunities for better results. In this short paper (open only until May 16, 2007) you also find details about what kind of information users are willing to give more or less often.
More of this research will be published on the KnowledgeStorm Inc. Homepage