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What are the most important/popular applications of eigenvalues and eigenvectors in practical terms, in fields such as computer science and computer graphics?

Wikipedia does mention some but doesn't really elaborate much.

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Eigenvectors and eigenvalues are important for understanding the properties of expander graphs, which I understand to have several applications in computer science (such as derandomizing random algorithms). They also give rise to a graph partitioning algorithm.

Perhaps the most famous application, however, is to Google's PageRank algorithm.

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PRuler is an iPhone app that lets you measure objects using a credit card and your iPhone camera. I'm told it uses a Singular Value Decomposition (which is very closely related to eigenvalues and eigenvectors)

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