This video shows all commercial air traffic in the world during a 24-hour period. Although the technique used is very simple in principal, it conveys a huge amount of information in a short space of time.
From gdyel2007 at dailymotion via TechTalk Newsletter.
I use various simple visualisation techniques in my table planning software, for example males can be shown in blue and females in pink. This allows the host to check at a glance whether they have a good distribution of genders.
Could you use colour, shape, size, positioning, motion or other visual cues to better convey information to your users?