The Matrix has you

Currently one of the most active projects (#4) at SourceForge, and which I'll bet is just itching to be blogged to death, is a neat little Windows desktop enhancement tool called ZMatrix:

...which creates the streaming character effect out of 'The Matrix' on your desktop. The program will blend with an existing background or be drawn overtop of it and does not impede normal desktop operations.

It works suprisingly well on my archaic Pentium 266 - highly configurable, and doubles as a screen saver. You gotta love OSS!