"RSS" (Really Simple Syndication)

A useful tool i learnt recently... DO you noticed that there is RSS icon at the right hand side of the address bar for some pages you visited.  Click on the RSS to see the latest changes to the website.  This tool is useful if you want to check for updates to sites that u visit often.  You can install a RSS reader and subscribe to RSS feeds so as to be notified of any updates to the site you frequent.  

More info at  http://en.wikipedia.org/wiki/RSS_(protocol)