The M4 Competition to compare the accuracy of forecasts from different forecasting methods and forecasters is well underway, but it is not to late to participate. The deadline for the 1st Forecast for the High Profile Fortune 500 (Live) Dataset has been extended to 30 December 2010. Deadlines for other series are at quarter-ends over 2011. For details of the Competition and how to participate, see the M4-Competition homepage.