Oh, it appears to load fine for me, I'm using Chrome. Its lag and stutter a bit on IE though.
I liked the way it took you from one page to the next without a reload of the page. When you click on a link, you can see the original content slide out and before it disappears completely, you can see the new content being brought in. At one instance, both the old and new content are on the same page, although very briefly. It creates a very nice illusion of simply flipping to a new page of the website.
I know about the jQuery animate function, the animation isn't what is intriguing me, it's how they handle the transition to another page without actually reloading the page. The url just changes without the page having to reload.
I know it's a bit hard to explain, but does that make it a bit clearer?