Diff-IE is a prototype Add-on from Microsoft Research for Internet Explorer, that highlights the changes to a webpage since the last time you visited it and enables you to view and compare previously cached versions of the page.
Web pages change in a variety of ways. When changes are made obvious, especially the subtle and unexpected ones, you get a whole lot more out of the web pages you visit
Once you download and install this add-on, as you browse the web, you will start to notice how pages change. Since these changes are only tracked after you install Diff-IE, it may take a vist or two for these to show up on your favorite web site.