Dave Rupert shares 5 responsive web tips: Surrender control and let go of ‘pixel-perfect’ design. Embrace fluidity. Think in terms of proportions rather than pixels. Use min-width (aka build mobile-first) Use relative units, not pixel-based units.
The debate rages on: to create a separate mobile site or to create a responsive site? Mitt Romney made a separate mobile website. Barack Obama made a responsive site. I go through in detail the differences between the two approaches.