The plugin is called foo_wsgui.dll (foobar window shaded GUI). It's being developed by danZ, and it's in alpha stage by now. You'll see good, bad, small and big things, but the point is that people will have freedom for choose their "look".
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I use foobar minimized and the globes of winXP enabled, so the globes tell me what song is played.
I keep giving you a move of mouse and two seconds for see the title. And maintainig my last offer for go to the back or next song.
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And about Peter I was joking, but really I don't like that foobar skin like winamp look
Hehee, I don't like Winamp3 itself.