This fell off the mailing list:
lcrocker@nupedia.com wrote:
Try: [[Media:Morepork.ra|Sound of a morepork]]
I don't think it's appropriate to put Realaudio on Wikipedia. The only sound format that is readily usable by freely-available software on multiple platforms and that is compressed for Web transfer is Ogg Vorbis. Especially now that they've released 1.0, I see no reason to use anything else.
The software already semi-enforces this by accepting ".ogg" files without complaint while it warns about other extensions.
That's also one reason I haven't chosen to document the "media:" feature yet--I wanted to get some consensus about its appropriate use, and maybe do it differently.