In some recent messages, it was suggested to distribute OGG code.
An equal deserving cause are fonts to obscure (to me) fonts. I have been working on wiktionary and in the process I have had to find fonts for Khmer, Georgian, Cherokee and a few others. I have no clue if I have the best fonts in the ones that I picked/found.
By adopting fonts and promoting them, we stimulate the development of fonts, some cannot be had for free afaik like Etruscan.
The aim of Wikipedia is to share all the knowledge, this means that the knowledge must be visible. Promoting good free fonts and making them easily available is one way.
Thanks, GerardM