Going to the above link seems exploit a pretty nasty rendering bug. The bug exists in at least 3.0.4, 3.1 and the latest Webkit running in 3.1. Looks fine in Firefox.
If you load the link in a new tab, it initially appears to be just rendering right-aligned instead of centered, but something else is wrong. If you load the link into a tab that already has a page in it, you'll see that the old page stays on the screen to the left of the new page's content. If you switch tabs and return to the landwatch tab it'll bring the last tab's content onto the page.
Now, here's where it gets really nasty. It doesn't matter which tab method you started with, just start resizing and scrolling the window and all sorts of rendering crap will start appearing.
Similar to the bugs where the root element has display: other than block, here the <html> element is float: right.
Test site has been redone, but even if I apply a float: right onto again I can no longer reproduce the bug so I'm resolving this issue.