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Very interesting article.
People should also consider that we're all effectively made of stardust, anyway. All heavy elements, elements past helium, had to be manufactured inside a star, and then spread out through space via stellar death (planetary nebulae or supernovae).
So it's definitely interesting that life-critical components may have been delivered from space, but as for life originating off of Earth, I think this is unlikely. It's possible that it could have come from Mars or elsewhere in the solar system (exchange between planets is feasible), but from beyond is highly improbable.
I'll try to back up my claims with sources later [too close to my bedtime]. In the meantime, just google "panspermia."
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