It's a good website. It looks like they finally support tabbed browsing, but a less rigidly-enforced product hierarchy and better support of metric measurements would make it a lot better.

For example when I'm buying a sheet of steel, this list ordering isn't as easy to work with as it could be: 3/32", 0.095", 0.1", 1/8", 0.134"..., 1 mm, 2 mm, 3 mm...