Some days you just want a good Matrix screen saver. I downloaded three different ones to try out - and of the three, only one worked properly on my Windows 7 dual-screen monitor. It's a nice screen saver, includes some good options (like turning off after x minutes if you want, turning on/off the trace program sequence, changing speed and density of the falls), and it's free. The link to it on Download.Com is http://download.cnet.com/The-Matrix-Screen-Saver/3000-2257_4-10067722.html.
Perhaps this will save someone a few minutes of searching and testing.