Got heaps done today, i picked up a 10 dollar game pad from dick smiths, ripped it appart, configured the buttons to be key strokes, ran leads from the game pad to the existing momentry buttons in the front and then plugged it into the internal usb header.
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The front hooked up. wiring has been hidden since this shot, the PCB fits nicely between the PSU and HDD so you can hardly even see it.
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So now the front play - pause - stop buttons work through winamp. the cd eject button wont be used with the slimline cd rom so that has become a button to switch playlists through a winamp playlist switcher plugin.