[masklinn]

> Isn't Foundation already responsive?

Yes.

> Don't most websites built with Foundation's grid system automatically fit nicely on mobile devices?

Yes, but responsive designs always means tradeoffs, and those tradeoffs will be different depending whether you're "desktop first" and scaling down or "mobile first" and scaling up. And of course, the framework can set a course on what to check and where to start from.

Luke Wroblewski is a big advocate of tackling responsive design from the bottom ("Mobile First"): http://www.lukew.com/ff/entry.asp?933 http://www.abookapart.com/products/mobile-first and he apparently pushed for Foundation 4 to much better support this design style.