Vorbis is definitely catching on in popularity, but certainly right now it's a small amount of people that are using it. I think in the next year or two that may change, at least in certain circles. Hardware support is definitely one thing that hampers Vorbis's adoption though, so it's a bit of a chicken and egg problem. Would you try it if your empeg played Ogg Vorbis files, given that winamp, xmms, media player, etc. have plugins?

As far as the empeg guys go, I can't speak for them. But from my communications with them, it sounds like they want vorbis support.

Jon