Siri, a voice-controlled virtual personal assistant that relies on artificial intelligence, is the most advertised feature of the new iPhone 4S from Apple (AAPL).

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Just like Siri, Alfred is billed as virtual personal assistant.

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One part virtual notebook, one part personal assistant, Springpad helps you remember stuff today so you can make better decisions tomorrow.

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Just one example: Signature Labs, a small start-up, is running a test of their new App with Neiman Marcus to create a virtual personal and highly-tailored shopping assistant using your iPhone.

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