There are several application suites on the market that include multiple taskbar functionality (such as Display Fusion Pro) but if you don’t need all the extra features and simply want a functional taskbar, Dual Monitor Taskbar is an open source application that offers Aero peek, a system clock, and application pinning.
Hit up the link below to grab a copy and extend your taskbar today.
Dual Monitor Taskbar [Sourceforge via Addictive Tips]