Neat tool for understanding responsive web

We are helping a new client consider how to bring their website layout into the mobile world. In coming up with some links to move the discussion along, I found this great tool for visualizing the idea of responsive web:

Responsive Wire Frames

Nice simple tool, check it out! 3PRIME is building mobile optimized websites for 2 local companies in CT at the moment and we look forward to bringing additional mobile-ready websites online in the next 6 months!