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klark0 - 3:02 pm on Jan 15, 2013 (gmt 0)
I think what you're describing is what the kids call Responsive design, today.
Google has guidance on it:
[developers.google.com...]
The mobile Googlebots crawl with user-agents of actual mobile phones (the iPhone, a Samsung, etc ). So if you serve mobile content, they pick it up and treat.