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The Robert Boyle Project, University of London
Official homepage of Robert Boyle (1627-1691 CE). The site is very comprehensive in its information about Boyle. The site has links to a bibliography, his works, correspondence, etc.
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1728 Software Systems: Boyle's Law Calculator
This online calculator allows the student to solve for either Pressure or Volume. Other features include a tutorial explaining Boyle's law.
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Aquaholic: Introduction to Boyle's Law
Provides a great introduction to Boyle's Law as well as a link to a more detailed explanation if that's what you're looking for. Gives a real life example that is very helpful in comprehending the law.