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Not sure about the security benefits, but I love this idea of adding a hash= attribute to any html element that can take a href= or src= attribute. The hash= value is "a base 32 encoding of the SHA of the object that would be retrieved." This would be good for caching, as the article suggests, but I'm more interested in the reverse - it would help with the problem of old objects already in the cache being used instead of updated objects on the server. In this case the hash values wouldn't match so it would force the browser to fetch the updated object.
My friend recently bought a MacBook. It really comes pretty set up right out of the box. There are just a couple things I would do for a new machine, and here they are