The ultimate tool for responsive screen size sketching. Heavy-duty gauge stainless steel ruler with pixel increments. Markers for mobile, tablet and widescreen (laptop) sizing.
http://www.uistencils.com/products/pixel-ruler
Responsify is a browser based tool, which allows you to create your own responsive template. Think of it as a foundation for you to build upon. You can customise the grid to suit your content, rather than trying to make the content fit the grid.
http://responsify.it/
Metro is a design style and language developed by Microsoft. Products like Zune, Windows Phone, Xbox and the soon to be released Windows 8 follow the Metro design style.
http://www.blinkux.com/metro/principles.html
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