First of all, TOP name for a site "sodium-chloride" is the grid/cube meant to represent the structure of salt/sodium chloride, or is that just a coincidence ?
Anyway - Damn nice site, regardless of if its you r first or not, pretty slick especially the animated letters on the first page.
Mouse-vers were nice for the 3 main sections, but they bobbled slightly to much for my liking, i think it would look better it they just rotated smoothly.
Drop down menus need to be easier to read, justa little too much _alpha there, got a bit confusing with the background text.
Very nice colros, even better graphics, the baove points are minor. It is a very nice site and easy to use, i liked it.