Google announced to drop the old adwords keyword tool permanently and switch over to the new one by end of this month. The “new” keyword tool has been in beta since September 2009 and we ultimately knew Google would phase out the old keyword tool in exchange for this new one. Now we know when.
Google said the old keyword tool, which is currently accessible, will be available throughout the end of this month. September 1, 2010, the old keyword tool will begin redirecting to the new keyword tool. Google promises to update us when the switch over happens and also promises to drop the “beta” label from the existing tool.
Source : http://searchengineland.com/google-to-drop-old-keyword-tools-by-end-of-month-48500