Well, there’s not really that much magic involved, but it’s still pretty handy,
here’s a little python script thats sucks down all the slides on Distributed Systems from Kriha.org.
Put it in an empty folder and run. The result will be a shitload of PNGs, wich is much more enjoyable than having to click through each html-slide.
Btw, try CoverFlow and/or QuickLook to view the slides, works great for me.
The naming scheme looks like this: lecture#-lecturename_slide#.png
script can be found here: http://gist.github.com/291141