I added the following lines to my /usr/share/X11/xkb/symbols/inet to support 
all the keys on my Asus laptop and was thinking it might be usefull for others 
too.

// Asus

// Asus A6000 series Keyboard
partial alphanumeric_keys
xkb_symbols "asus_6000" {
    key <I20>   {       [ XF86AudioMute         ]       };
    key <I2E>   {       [ XF86AudioLowerVolume  ]       };
    key <I30>   {       [ XF86AudioRaiseVolume  ]       };
    key <I6C>   {       [ XF86Mail              ]       };
    key <I32>   {       [ XF86WWW               ]       };
    key <I10>   {       [ XF86AudioPrev         ]       };
    key <I19>   {       [ XF86AudioNext         ]       };
    key <I24>   {       [ XF86AudioStop         ]       };
    key <I22>   {       [ XF86AudioPlay         ]       };
};

Arnout