Pixar's website is perfect. They have a single navigation system on their front page, and the rollover state is the selected state as well. The hierarchy is pretty clear– they want you to explore their work, feature films first (probably since they make the most money and had the most time invested in them), short films second, and then a bunch of process links. The navigation never disappears, and the selected state lets you know where you are at all times. You can also always navigate back home. The site doesn't have very deep architecture, and the look remains constant. You cannot get absolutely anywhere in one click, but it's pretty close.
The typography is pretty simple, and text on the site is minimal. The more prominent type is larger and bolder, and the subordinate is smaller and lighter. The grid is constant on all pages. The focal point is pretty clearly the center portion of the page. The images are located there, and are clear and gorgeous. It presents the work well, especially the "How we do it" section of the page, which uses a viewmaster MUCH MORE EFFECTIVELY than Bowhaus. There aren't really any icons or symbols. The page is mostly done in white and shades of grey, and the full color comes on the images. The white space on the page lets the images pop nicely. THe objective of the site is to showcase Pixar's work, and it does a nice job through gorgeous imagery, different kinds of media, and a wide variety of content. My favorite feature of the site is the "how we do it" section. They also have a neat section showcasing different artists.

This site is perfect. Nothing to improve.