The PhD Media/Ipsos Mendelsohn report concludes some (but not large numbers of) consumers will pay if they perceive value and can't find the material elsewhere. It shows precious little overlap in the consumption of print and online editions of the same content.
The more interesting conclusion, though, has to do with brand: It's not as relevant as one might think (although one would have to think that perceived value has to do with brand authority). Rather, people are big searchers and find the material they want increasingly on their own instead of turning to brands to deliver it.
In assessing the report, Julia Boorstin of CNBC Media Money says media will either have to start charging en masse (unlikely) or target content carefully to have a chance of getting revenue (more likely).