Google has published a guide called Multi-Screen Resources page to aid development of sites for smartphone and mobile screens.

Any Place, Any Time, Any Device: Building Websites for the Multi-Screen Consumer. Download this new guide for a close look at the pros and cons of common mobile website configurations. You'll find tips and best practices for improving the layout, content and speed of your mobile site. This white paper will help you build a great experience for all your users.

Approved vendors. Find a list of website vendors who can help you design a site, build a site, tweak strategies and go multi-screen fast.

Success stories from others. Read how the Huffington Post boosted mobile visits by 37%, or how Beyond the Rack created a mobile site that now accounts for 44% of their sales.

Tools that work. Try the PageSpeed Insights tool — it can help boost your site performance.
Strategies and Resources For Multi-Screen Sites [adwords.blogspot.com]

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