[Limbo]

Seems a very misunderstood subject. Some Helpful reading:

Link list: Designing With Grid-Based Approach | Smashing Magazine

This is a favourite example of mine: Subtraction: Grid Computing… and Design

This is good for the newb:
Five simple steps to designing grid systems - Part 1 : Journal : Mark Boulton

And something with a bit more depth:
http://www.subtraction.com/pics/0703/grids_are_good.pdf