@rjamorim :
Plugins bundled with players : I've got winamp plugin + xmms plugin so why would I need another??
Hardware support : I've build my own music standalone pc that has a high quality soundcard (terratec 24/96) and vid (radeon 8500) in it. I use to play music and watch movies. So I've build my own hardware support in a way.
Plugins for cdburners : I can decode everything to WAV and burn away.
MPC streaming : okay I can see that this is a prob. But I'm not in all the streaming thingies so it's not really of an interest to me.
btw we got vorbis for that don't we

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File sharing support : I think filesharing progs like kazaa and winmx are junk! FTP is all I need so I can share with my friends and people I know of that are also concerned with quality.
(for example when you would like to download an mp3 and you've got 2 choices a 192 kbps and a 320 kbps which would you go for?? of course the 320 kbps one, but then again keep in mind there are lots of morons that encode there downloaded stuff from 128 kbps to 320 kbps because they think it will sound better)
to put it simple filesharing progs are a big no for me because you don't what you get.
Owkay let's put it this way, when I think of vorbis, mp3, wma, ...
I think of perhaps good quality but then again perhaps not.
But when I think of mpc I immediately think of quality because I know that the people that have encoded into mpc must have done some research because they didn't take the mp3 way like many others do.
Okay there are exceptions

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I would like to say that I think every format has it's place and is great in it's role. And I think the role of mpc tends to be quality.