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I'm in a hurry and on plain old copper line internet connection.
But LaTex could also be used to producer presentation, just like MS PowerPoint with the use of the package "Prosper".
The last time I used it (that must be hmm 2 years ago), there already was "themes" that is templates for you presentation.
Of course, one can not expect to find all the supported "objects" that PowerPoint supports (like embedded video), but the point is that if you decide to write say, a Master thesis with Latex, you could also use Prosper to write your presentation !