Summary: he made a 960-like stylesheet framework that increases the overall width, the size of the gutters between columns and cleans up the markup.
I've been using 960 for a few years and the markup detox is really nice. Adding clearing divs always felt like a dirty tradeoff for design consistency.
I'm torn about the extra gutter space though and I think I'd rather stick with 960's narrow 20px because it's more flexibile. You can group stuff together or break them into sections. For example, you can pack in related items real tight, like a row of thumnails in a gallery, or use the technique he described to pad out the 20px and create discrete elements like sidebars, containing boxes, etc.
I've been using 960 for a few years and the markup detox is really nice. Adding clearing divs always felt like a dirty tradeoff for design consistency.
I'm torn about the extra gutter space though and I think I'd rather stick with 960's narrow 20px because it's more flexibile. You can group stuff together or break them into sections. For example, you can pack in related items real tight, like a row of thumnails in a gallery, or use the technique he described to pad out the 20px and create discrete elements like sidebars, containing boxes, etc.