I was looking for tools to draw area-proportional Venn Diagram, but most of them either do not work in some cases or very difficult to use. Finally, I found a very very good one!

A very very nice tool to draw Area-Proportional Venn Diagram:
Area-Proportional Venn Diagram

http://bioinforx.com/free/bxarrays/venndiagram.php

I can also edit the Venn Diagram including labels, size and positions:
VennDiagram-02

So far this is the best I found on the web.

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