There has been a fair bit of banter on the concept of Enterprise 2.0. If you want to find out more about what it is or the core concepts behind the subject then follow up over at Billy Cripe's blog. You will find his explanations and the links he provides a good place to get started. He has even collaborated on an entire book with a lot of information about it.
The problem as I see it lies less with whether or not Enterprise 2.0 is a good idea and more with how the economy is driving corporate structure away from adopting new process. Certainly everyone wants to hear about how to accomplish more with less or all about new ways of intelligence discovery. The crux, however, is not many feel like funding a foray into this new frontier.
With the economic uncertainty attaching itself like the proverbial 800 pound gorilla there will still be market leaders that forge ahead, willing to take risks like introducing new technologies and fundamentally different approaches to interoffice communications, but a majority will not at this time. Those that do make an attempt and survive may enjoy a competitive edge in the end.
Most will shy away. This may mean the sound of the death knell for Enterprise 2.0, a premature ending to a promising approach. I for one suspect this will only slow or postpone adoptions instead of kill this direction all together. Ultimately, I find the whole process fascinating and I find the fervor with which people discuss the usefulness or lack thereof even more fascinating.