Bootstrap 3 Grid Introduction
helloerik.com
helloerik.com
(im the author if that wasn't clear)
Unless you just want a grid and no other part of the Bootstrap styles. I think if you only include the Bootstrap grid in your compiled CSS, it's pretty lightweight. Not as much as this, but you don't need to include everything else.
Once you get used to it, the grid classes makes it easy to look at the markup, see whats going on and move things around any way you choose.