UltraMon is a utility for multi-monitor systems, designed to increase productivity and unlock the full potential of multiple monitors.
New mirroring feature: the mirroring feature is now available on Windows Vista as well, and has several new modes, in addition to mirroring one or more monitors, you can mirror only a single application, part of the desktop, or the area around the mouse pointer.
Zooming is supported, and mirroring now preserves aspect ratios when mirroring monitors with different resolutions and aspect ratios. You can pause mirroring (freeze the mirror display). Due to no longer using a display mirror driver, compatibility issues with some video card driver versions and installation issues have been fixed.
New security feature: all binaries are DEP (Data Execution Prevention) and ASLR (Address Space Layout Randomization) compatible.
Tools and Utilities
Product page: here