For example, here's one goodie brought by pd-fileutils
:
http://sebpiq.github.com/pd-fileutils/?gist=<http://sebpiq.github.com/pd-fileutils/?gist=5054711 gistId>
And your patch should be rendered to SVG. You can then send this link to anybody to show your patch :)
Of course for now the SVG rendering is super crappy, but I am working on it, so it should be better very soon.
Cheers,
Sébastien