An interesting article at BBC highlights a new invention which puts electromagnetic shielding into paint. They claim it blocks 100 GHz worth of spectrum, including consumer wifi which runs at 2.4 GHz here in the US. My first worry was regarding blocking cellular phones, which tend to run at lower frequencies, but the article presents that as a feature rather than a bug.
Really, electromagnetic shielding is hardly a new concept. Faraday cages are standard installations at most sensitive areas; supposedly to block TEMPEST attacks, although I doubt that's used except by serious espionage folks. The article mentions that movie theaters could use it to block reception during movies, but I think other mechanisms for shielding are probably more practical.
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