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ArtsTechnica links to a few other riffs on that concept, such as a Popular Science trlanastion/summary from the German blog Surfpoeten: a software filter that selectively mutes the particular frequency of the vuvuzela. The horn drones, apparently, at 233 Hz, with harmonic overtones at 466 Hz, 932 Hz, and 1864 Hz. The idea is to create a series of bandpass EQ filters in Logic Express software, and run the TV audio through a Mac. Or, you can find instructions to create a vuvuzela filter on a system running Fedora.