Disable trackpad when mouse is plugged in - Windows 7 Macbook Pro
TrackpadMagic does this. Per the author, versions "newer than 5/26/2009 are tested on Windows 7 x64 on Santa Rosa Macbook Pro, older versions tested on Windows XP. Unibody Macbook Pro tested on Windows Vista."
It requires the .NET framework, links are supplied on the page.
Screenshots from their page:
