video card with 2 outputs, one VGA and one DVI. And actually I switch between one that just does an pictures slide show, and one that has that Matrix code flowing on the screen. Here's the thing, sometimes when I use the built in Windows Bubbles screen saver, where it doesn't turn the screen off but just has objects moving around the desktop, those seamlessly transition between monitors. Oh yeah, I'm running UltraMon as well.
Another somewhat related issue, is there a free app out there that can lock the mouse to one monitor? When I play RTS games like Command and Conquer, I can't drag the mouse in all 4 directions, as it will just jump off the screen when I drag the cursor that direction.