[OS X TeX] Program to draw Venn diagrams?

[John B.Thoo]

Hi.  I'm sorry that this is not strictly a TeX question, but I'm not 
sure where else to ask.  What is a program to create Venn diagrams 
conveniently that I may include in my LaTeX document?  (there, now it's 
TeX related ;-)  I'm interested in shading intersections and unions.  I 
tried using xfig, but it isn't apparent to me how to shade 
intersections or unions of circles or ellipses.  I'm using Panther.  
TIA.

---John.

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