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A new an enhanced version has just been released, featuring the ability to select which monitors have slipping protection, and a wonderful cursor locator. You can find all the details about Mouse Trapper and then newest version here.
Mouse Trapper has been featured on several sites, including CNET:
http://download.cnet.com/Mouse-Trapper/3000-2317_4-75878300.html?tag=rb_content;contentBody
And others:
http://operating-systems.wonderhowto.com/how-to/use-hot-corners-more-easily-dual-monitor-windows-8-setup-using-mouse-trapper-0140289/
http://www.softepic.com/windows/system-utilities/system-miscellaneous/mouse-trapper/
http://www.soft82.com/download/windows/mouse-trapper/
http://www.addictivetips.com/windows-tips/stop-mouse-cursor-from-slipping-to-secondary-monitor-in-windows-8/