Known problems with Gecko SVG
Gecko does not support SVG SMIL animations  at the moment. Declarative animations could be very useful for teaching. Think about moving maschines.
Blog about SMIL in Firefox 
Svg in this wiki
SVG is a recomended image format for olpc. The wiki is not SVG enabled and gives this warning:
- Upload warning ".svg" is not a recommended image file format.
Wikimedia 1.5 supports SVG, this must be enabled in the wiki configuration. Wikipedia already supports SVG.