Generally, it is recommended to avoid qualitative measures when quantitative solutions exist.  However, if the genuine need arises here are a list of useful Venn diagram widgets that may be found online:

Quite Powerful:  http://bioinformatics.psb.ugent.be/webtools/Venn/

Simple Solution: http://www.bioinformatics.lu/venn.php

Downloadable:  http://pcarvalho.com/patternlab/vennDiagram.shtml

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