Way back in the mists of time, I wrote a screen saver for OS X which produced animated green glyphs moving on the screen, in the manner of the movie "The Matrix".
This screen saver was astonishingly popular. It got 30,000+ downloads in the first weekend, taking out my web hosting. It got put on magazine cover disks, and translated into Japanese.
When Apple made the transition to Intel, it took me a while to follow suit. Because I'd released the source code, other people were able to produce Intel builds fairly easily.
With Snow Leopard (OS X 10.6) however, Apple broke every single third party screen saver. This time, though, I happen to have a new(ish) Mac, and have upgraded my OS, so thanks to the info from jwz's justified ranting, I've managed to put together a 64 bit build of RedPill for OS X 10.6 Snow Leopard only. If you're running an older version of OS X, keep using the old version.