The difference between SOA and Web 2.0 (and they have as many similarities as differences, see here: http://blogs.zdnet.com/Hinchcliffe/?p=107 ) is that Web 2.0 -- and this very much includes Enterprise 2.0 -- is also an bottom-up phenomenon that can (and will) happen without management support. SOA, on the other hand, is much harder to develop on the edge without IT involvement. This is a crucial difference.
I usually cite a long list of companies that have discovered rogue wikis that have flourished in their companies, sometimes pushing traditional ECM tools to the edge of the organization (AOL is a prime example and so is Constellation Energy, and there are many others.)
Dennis may be missing the point that these things are happening despite management and my point is that is the hold up. Like Euan Semple said, the easiest way to do E2.0 is to do nothing at all. Workers are NOT waiting.
But it's small ROI for now that management may even stamp out before they realize what it's worth. The real value is when the top-down meets the bottom-up, IMO.
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