This Is Responsive | Tips, Resources and Patterns for Responsive Web Design
Patterns, resources and news for creating responsive web experiences
The Grid System
The grid system is an aid, not a guarantee. It permits a number of possible uses and each designer can look for a solution appropriate to his personal style. But one must learn how to use the grid; it is an art that requires practice.
Gridulator: Make pixel grids, lickety-split
Tell Gridulator your layout width and the number of columns you want, and it’ll spit back all the possible grids that have nice, round integers