Giovanni Zappelli, from Ericsson, gave an interesting presentation on the ecosystem needed for mobile web to take off.
It was uniquely focused on media brands and seemed to suggest that advertising is the only viable business model [there are certainly other models, but there's little doubt that advertising will be one of the main ones].
His most interesting slide was this one, looking at the example of CNN's mobile site and the relative traffic growth provided by promotional activity, organic growth and - most interesting - the redirection of mobile traffic from CNN.com.