How to do Responsive Design and Media Queries:
http://www.alistapart.com/articles/responsive-web-design/
How to do Media Queries with Compass ( Sass ):
https://github.com/chriseppstein/compass/issues/302
Screen Resolutions:
- Ipad / Tablets 1280 x 800, 1024×768, 1024 x 600,600 x 800
- Iphone / Android 960×640, 480×800, 240×320