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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.
The traditional "application server" category is being shaken up by new entrants SpringSource and MindTouch.
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.