You should have noticed an announcement on the Google AdWords Keyword Tool interface. It says that, in the coming month, the External Tool will no longer be available and you should use the new Keyword Planner instead.
The new Keyword Planner tool gives data much like the External Keyword tool did but there is one big improvement – it includes searches done within specific geographic areas. If you are into local search, you will appreciate the new tool and we hope some new features will be added before the old External Keyword tool is retired.
The Keyword Planner interface will take some time to get used to, for those familiar with the External Keyword Tool.