I spend quite a bit of time on both sides of this issue: both doing design work and implementing it. The appeal of GSS definitely lies in how similar it is to

I spend quite a bit of time on both sides of this issue: both doing design work and implementing it. The appeal of GSS definitely lies in how similar it is to how I conceive of layouts functioning. As a designer I want the grid to be based on divisions of the page, and every piece of software I work on appears in many different "page" sizes depending on the device, resolution, &c. It's not just that I want my grid fields to proportionally resize themselves, but that the elements themselves need to reorganize themselves to suit different grid conditions. All of that is really just to say that I also want to see answers to your first question. GSS seems like a reasonably good way to think about this, but I want to see more examples of it in the wild, esp. in production.