If I had this much spare time at work I would probably do the same thing.
Check this out:
A little NSFW - not in terms of the graphs (yes, there are graphs! and charts!) because they are graphs, but maybe the text of some of them. Nice links to the videos on YouTube too.
Props to people's links on Gchat for this one.
Other fun things to do to keep busy:
Free Rice (if you haven't heard of this by now you probably don't have enough spare time in the office to play with it)
Throw Paper (only after you've given at least 50 grains of free rice)