Designing Responsive SharePoint site  either Public internet facing or intranet is Complex one or easy . .
I feel now a days web desiging of your SharePoint application is playing important role for successful implementation .
Please sugggest pointers and any examples you have to start with responsive design for SharePoint.
Thanks in Advance.
Hi,
I used this project multiple times in projects:
http://responsivesharepoint.codeplex.com/
This is for intranet sites. I made a short blog post about my experience implementing this:
http://bastiaanjacobs.nl/2014/01/30/sharepoint-2013-responsive-mpb-bootstrap/
Internet facing sites that use SharePoint as CMS can be created with the use of REST and  OData especially Get.
For responsive design I see that a lot of people underestimate the behavior/customization for multiple resolutions and devices.