Bookmarklets

I don't know if you have ever heard of bookmarklets, but they are useful little javascripts that you attach to your favourites on Internet Explorer. They are simple, safe and free. Take a look at the Bookmarkets homepage. Of particular use is the page freshness bookmark which gives you the date that a webpage was last modified in a little pop-up window. This is useful in that when you are referencing a webpage, they frequently do not state when they were written. So when you are referencing such pages it is good practice to add the 'date last modified' to your reference

A good description of bookmarklets is available on the about.com webpage Bookmarklets for Power Users