I've noticed most websites use static layouts for 1024 pixel resolution.
Designers seem to think if people have a full HD monitor theres no point in using extra space.

Any comments on layout width?

Amazon has a really great system.
You can resize your browser window, and it automatically re-tiles the display area with products to fit.
What technology are they using for moving the DIVs around?
This might be a bit too fancy for me right now. I might just detect browser resolution when the page loads and align stuff at that point in time.