MVR 3D created one of the best Matrix screen savers out there.
Since the Mvr.us homepage seems to be off the internet I am hosting the original downloads here.

Revolutions shows a 3-dimensionally animated Matrix code, dropping from top to bottom but also slowly moving away from you into the deepth of your sreen. Every minute or so the words Matrix Revolutions appear and are then slowly resolved again.

This screen saver requires DirectX 9 or higher.