Harmonic Function Theory and Mathematica Save
Performs symbolic manipulation of expressions that arise in the study of harmonic functions. This software is available electronically without charge.
http://www.axler.net/HFT_Math.html   

L.L.Helms Homepage Save
Author of 'Introduction to Potential Theory'. Contains information about his forthcoming book 'Potential Theory, the Dirichlet Problem, and the Other Problem'.
http://www.math.uiuc.edu/~l-helms/   

Northern Illinois University - Mathematical Atlas Save
Gives a brief description of potential theory with some indications of textbooks/tutorials and links to other web resources.
http://www.math.niu.edu/~rusin/known-...   

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