This site is made with ikiwiki. Here are the adaptation I've done to this system.

Nice hierarchical navigation bar

I was quite unhappy with the navbars provided by default by ikiwiki, and none of the proposed plugin really convinced my either. I thus hacked one of them to make it fit my own taste. I simple keep this navbar.pm in my plugin directory. It parses the menu structure from a separate file, named navbar.mdwn (historical name, sorry) Rename this file from navbar.configuration to navbar.mdwn (I'm changing its name to avoid issues on this very page), and copy it to your the root directory of your ikiwiki installation.

I think that this is it. I can't remember whether I modified the page template because that's quite some times that I did it and I didn't "document" it on time. I'd be glad helping you if the script fails on you.

Sharing pdf slides without proprietary web

Another plugin missing in ikiwiki is pdfshare, something allowing to share pdf presentations on your pages directly, without having to use crude proprietart stuff such as slideshare or similar. I hacked something here using the hints of the ikiwiki bug report above, but I didn't manage to integrate it properly to ikiwiki unfortunately. Check this blog entry for more info.