I went crazy with a tool that helps me tracing raster images. Thought other might like it.

It doesn't auto vectorize image, but rather allow for guided process. Final SVG still should be edited.

Few fun features like genetic algorithm fit optimization, semi-manual tracing and color preservation.

Perfect if you want to have lightweight SVG from huge PNG image.

Note: If there's interest I might open-source it, just not sure if anyone would want to see it :)