Re: LaTEX and Wiki
The UniWakka wiki clone
http://uniwakka.sourceforge.net/HomePage
has a very comprehesive math support. And Latex export.
They generate MathML, not pictures like wikipedia.
As far as I understood they use a php script that can convert ASCII representation of math to MathML so no latex or other external progs are needed.
http://www.jcphysics.com/ASCIIMath/
Here is their math demo page
http://www.istitutocolli.org/uniwakka/MathInsert
looks impressive.
I'm currently trying to create a TikiWiki based student site at my university, math capabilities are highly wanted there.