I discovered this after much pain trying to view it on my phone, subsequently trying to view it in Firefox, then (suspecting it was Webkit-centric), Arora, and I couldn't get past the first slide. I viewed it in w3m, now suspecting Javascript oddness was at fault, and was presented with a list of keystrokes (helpfully hidden by the Javascript that runs when you hit the page). In fact, it doesn't even load the slides (which are all formatted text--HTML! The thing browsers are for viewing!) until the Javascript runs.
From a quick glance at the source, it appears the culprit is some atrocity called "showoff", apparently. It would actually be easier to figure out how to view Powerpoint slides on my phone than it was to figure out how to view this thing.