I have used it for years – it was updated yesterday to now also support Windows 8….. Might be worth checking out based on if you need the features below. It does cost a few bucks but its a lifetime license.
Get the most out of multiple monitors with UltraMon™
UltraMon is a utility for multi-monitor systems, designed to increase productivity and unlock the full potential of multiple monitors.
efficiently move windows and maximize windows across the desktop
manage more applications with the Smart Taskbar
control application positioning with UltraMon Shortcuts
multi-monitor support for desktop wallpapers and screen savers
mirror your main monitor to secondary monitors for a presentation
Realtime Soft UltraMon