Drugs. They are bad bad things.
The Sony whatever the heck brand of CD burning and the ogg burning are they only interesting features I can see. What is so good about high MAT? More space/faster? I can burn oggs in linux btw so unless this high MAT turns out to be really killer thing WMP still sucks.
Not to mention that you can have winamp open without losing 90% of your screen estate.
online music store - cough, P2P, cough, music CD better than downloads, cough, cough
the visualizations support - um, who would be sad enough to just sit there staring at swirling colors while listening to music? oh and xmms can do those "things" too btw, not that you would want it too
easily and reliably burn CD's from the media player - not many OS's dont support cd burning these days. CD burning isnt the defining glory that it used to be, get over it. can it record DVDs? I dont think so...
oh and speaker effects/wow enhancements suck. This actually isnt anti WMP, all software based equalizers cant handle distortless audio modification. what you want is a hardware amplifier, software amping is only useful for making el cheapo headphones get a louder (although horribly distorted) bass response, its the same in linux and windows, s/ware amping sucks.
oh and have you read the WMP9 EULA? The one that says you give MS the right to upload "revocation lists" to your computer?
Oh and I know winamp is crap for videos, thats why i dont use it. Also it wont run under linux but hey. Oh and Xine isnt primitive boyo, you've never used it anyway so how would you know?