A few concerns I have are 1) the graphicpush site seems not to have any license information for the icon sets, so I think you wouldneed to make sure the stuff was licensed GPL compatible and 2) that we not make i18n much harder by replacing plain text with icons that contain text.
I personally like the gnome and kde icons (although
most are png's with alpha channels so have issues displaying on IE properly).
I absolutely agree on both concerns. Furthermore, if I'm not mistaken, we could have the internationalized text string popping up if the mouse moves over the icon.
As for KDE or Gnome, we could convert them from png, couldn't we ?