I'll be honest, the AJAX doesn't add anything for me. My ideal webpage has zero movement except scrolling. Things which I would suggest you changed, if you aksed me:
- loading images as you scroll. Let the browser do that. I'm probably going to look at all of them so I'd rather they load before I look rather than waiting for them.
- simulating a loading bar when my browser already has that
- breaking standard keyboard shortcuts (space and shift-space don't work)
- having headings that should be static move around on page load (that's a CSS thing)
- fading in and out on transitions