Summer sale at Binary Fortress, makers of DisplayFusion.
"DisplayFusion will make your multi-monitor life much easier. With powerful features like Multi-Monitor Taskbars, TitleBar Buttons and fully customizable Functions, DisplayFusion will make managing your multiple monitors easy."
A few other 'Fusion' products on sale, all have freeware versions too.
Edit: As Ben mentioned below, get it from Steam for 69% off.
http://store.steampowered.com/app/227260/
^ $9.30