Also 403 for Python. The other page are blank because they use <script ... /> which is not correct and should be <script ...></script> but the code is here if you look at the source.
Thanks for noticing that! I've fixed the code and it should work now. (It was probably only a problem for IE, please let me know if it's still not fixed.)
It seems fixed but it was not a IE only problem, I'm using Firefox v5.
Even odder, the text is actually there, if you view the source. I think maybe his pretty print javascript is going haywire.
I noticed that the Ruby pages link to files that end in ".rb.html", but if you remove the ".html" from the end, it leads you right to the Ruby files.