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There are so many things that can be done with a wiki like DekiWiki's that it's hard to define what it is. It's a bit like a "thneed" from Dr. Seuss' The Lorax.
Open source is alive and well, at least as measured by all the news coming out in the past week, a sampling of which can be found here.
The traditional "application server" category is being shaken up by new entrants SpringSource and MindTouch.