Google has taken a strong stance on mobile SEO, announcing there will be demotions if your site is not mobile friendly or is misconfigured when it comes to being mobile friendly.
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Google takes stance on mobile SEO:
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Google responds to threats by Murdoch
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Google empowers users to edit search results
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Cobra Electronics announces change in mobile navigation strategy
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Google analytics goes mobile
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Google rolls out new privacy policy amid criticism
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Google updates its privacy policy
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Google revamps search engine
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Google home page promotes Demo Slam
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Google eased it's privacy policy
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Google jumps into phone war
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Mobile medical units flagged off
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Google wants to remain in China
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Google denies fixing search engine results
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Apple asked Google not to use multi-touch in Android?
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Google now lets you block websites from search results
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Google has been criticized by users