Analytics Vidhya: A comprehensive data science website providing resources for pretty much everything related to data science/analysis. Their ambitious blurb: Learn everything about analytics.
KDnuggets: A website covering everything DS and ML related.
Data Machina: A weekly digest of data science curiosities, machine intelligence, data geekery, and other amenities.
Revolution Analytics (R): Daily news about using open source R for big data analysis, predictive modeling, data science, and visualization since 2008.
Becoming a Data Scientist: A website covering DS-related topics beyond just methods. Also offers useful information on career development.
Data Science Berlin: A collection of information related to DS in Berlin and Germany.