We've got both ISOs up for download at FileShack. Get the the United Nations' Global Defense Initiative (GDI) disc here and the Brotherhood of Nod disc here. This version of Command & Conquer Gold is Windows XP compatible and identical to the version included in the compilation Command & Conquer: The First Decade. EA has also provided installation instructions for the game.
The announcement on EA's Command & Conquer Web site promises further goodies every week during the month of September.