Diff-IE
Diff-IE is a prototype Internet Explorer add-on that highlights the changes to a page since the last time you visited it and enables you to view and compare previously cached versions of the page. When changes are made obvious, especially the subtle and unexpected ones, you get a whole lot more out of the web pages you visit.
System requirements Diff-IE requires Windows XP, Vista, or Windows 7, and Internet Explorer 7, 8, or 9 beta. Both 32-bit and 64-bit versions of Windows are supported, but only 32-bit Internet Explorer.
