The code I used in the Arduino sketch demonstrates direct port manipulation, which is a fast and powerful alternative to digitalWrite().
Update 3/10/2011 : Finished adding the Music Synchronization section of this Instructable.
Update 3/20/2011: I decided to build Lampduino instead of the coffee table.
Note that the flickering in the video below was caused by my video camera. When viewed with the naked eye, no scanning is perceived, and the lights do not flicker.
Music Sync Mode:
Arvid "Try (fenomenon remix)"
Syncing to Daft Punk's "Around the World:
Free-running mode (without music synchronization):