Im using ZURB Foundation 3 on a project of mine. I love grid systems and responsive sites but my issue is I still strongly believe they should be built wider then 1000px.
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Update: Please stop down voting this post. The framework has changed significantly since the question was answered. If you are using Foundation 4 or higher, please see the updated answers and up vote them.
For Early versions of Foundation 3 only Add the following override to your CSS (This must appear after or at the end of foundation.css)
.row {
width: 100%;
}
This will override the default with of the framework and make the design go full screen. Feel free to change this value to suit your needs.
There is also a customized download available at http://foundation.zurb.com/download.php (which probably does the same thing, overrides or replaces .row width)