3.0.7 works fine with the production version of Win 7 Pro 64.
Many Ultramon users want a screensaver that spreads the image across both monitors. Win 7 with Ultramon 3.0.7 can do this.
I run my monitors at 1600 x 1200 so I set up a blank Photoshop image at 3200 x 1200 so it will fill both screens and insert a picture. Place several or more such files in the same folder. Go to Win 7 Personalize and set up a theme using the images as the Desktop Background Slide Show. Set the images to TILE (important) and the time to whatever you want. Optionally select Shuffle.
I create two themes from the images and set one for 30 seconds for a screensaver\slideshow and the other at 1 hour for the desktop. Then I switch can between them.