Dual Display Mouse Manager lets you control & configure mouse movement between multiple monitors, by slowing down its movements near the border.
Dual Display Mouse Manager for Windows
Windows 8, lets you extend Monitor and Dual Screen Options. Dual Display Mouse Manager adds a useful feature – it slows down your pointer at the transition point between multiple monitors. Watch the animation at the home page to get the idea! It is especially made for people who use dual display or several monitors.
It prevents the mouse from crossing from one screen to another too easily and allows teleporting mouse pointer between displays with a hotkey.
Visit its home page to read more about its and download the freeware.
Its a definite must-have if you use multiple monitors!