Most of these are stolen from MetaFilter.
Welcome back to public blogging, Dan.
Musical instrument samples. My first UROP at MIT was at the Media Lab, where I helped record instrumentalists as part of a musical instrument identification system. Paris Smaragdis was there at the time, and now he is at UIUC where he has a lot of cool audio demos. There are also some great clips Inside the Music Library at the BBC.
Ridiculous computer interfaces from movies.
An Ergodic Walk 
Oh man, now I’m going to feel obligated to post actual content…
It’s not the “actual” that is the problem, it’s the “consistent” that is the hard part…