The fonts are microscopic here and when I increase the size to something half-readable then stuff gets pushed out the right side. (on the section-overview pages that is)
I also found this sidebar on the right of the articles very distracting. Don't throw unrelated content at me while I'm reading.
This is one of the few sites I've browsed on a Windows machine that made me instinctively think "oh the fonts look like crap because someone designed it on Windows and didn't think about Mac usability", since I'm usually on a Mac. That the fonts look nearly unreadable at any size on a windows machine is hilarious.