PixelCity Screensaver... A stunning screensaver which generates a nightly cityscape in realtime, and slowly flies through it from different angles.Originally a windows project by Shamus Young available at google code, ported and tuned to OS X. Source is included in the distribution.
Very Cool. A definite keeper. The Bloom effect is graphics intensive and makes it a bit choppy, but turn that option off and it's great. Although, I'd like to see the fly-throughs last a while longer.