Lately, Chemical blogspace has seen an interesting discussion on the quality of opendata and free chemical database (over 32 free resources now ), such as the NMRShiftDB.org. For example, see Antony’s view on the NMRShiftDB and Robien’s analysis. Opendata makes such quality assurance possible, and I am happy that the NMRShiftDB was explored like this; the found problems can be reported and corrected.