This came up in Universe chat earlier today--why not make the built-in MP3 player compatible for Linux and Mac (and possibly Windows 7)? Technology is marching on, and the player--which is compatible with Windows XP--is not compatible with any of the operating systems that players use most of the time. As usual, just have be an option alongside running a background program like iTunes or Windows Media Player or the like, but make it compatible with Linux and Mac (and Windows 7).
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Walking the bark and searching for understanding, always.