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.

Reloaded Pure shows a 3-dimensionally animated Matrix code, dropping from top to bottom but also slowly approaching from a distance towards you. After a while your viewpoint changes as well, moving it underneath or on top of the dropping symbols.

This screen saver requires DirectX 9 or higher.