Richard MacManus reports that Firefox 3 will allow semantic markups that connects your web apps together. This is a great idea, one that seems to merge the web 2.0 paradigm with the semantic web paradigm. However, I can think of ways this could be used by spammers (automatically add dates to your calendar, call all of your friends in Skype, etc) just by visiting a site, but I am sure there will be some sort of built-in system to keep this from happening.
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