Global Keynesianism: By James K. Galbraith. Some points on how Keynesians should react to the global economy.
Inflation and the Phillips Curve: A discussion on probably the most well known Keyensian theory.
The Keynesian Impact on Public Policy: A brief overview.
The Keynesian Revolution: A webtext on the history of Keynesian economics
Vulgar Keynesians by Paul Krugman: John Maynard Keynes himself was a magnificently subtle and innovative thinker. Yet one of his unfortunate if unintentional legacies was a style of thought--call it vulgar Keynesianism--that confuses and befogs economic debate to this day.
Why Aren't We All Keynesians Yet: Short piece by economist Paul Krugman.