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Take a look at ConTeXt too. It's much more powerful than LaTeX, at least it offers much more flexibility in the sense of design and XML processing. I was completely satisfied with LaTeX, but ConTeXt simply offers more - since I discovered it I comletely forgot Word and PowerPoint.
(It is TeX-based.)
An example document:
Two pages to start with:
http://contextgarden.net (ConTeXt WIKI)
http://www.pragma-ade.com/overview.htm (collection of documents)