A timely announcement: Xiph and Real just announced that they will be collaborating to make Ogg Vorbis plugins for RealPlayer and other software. Since it's now standard in WinAmp as well, I now see no reason at all to use any other format.
Pierre, if you can give me that RealAudio sound you uploaded in some other format (any other--wav, aiff, au, or even raw bytes), I'll recode it into an Ogg so that we'll both be able to hear it.