The Internet is filled with hidden features. Just spend a few minutes searching out Google's Easter Eggs and you will fill your day doing absolutely useless things, like turning the screen around with barrel rolls or searching for Chuck Norris and the meaning of life.
There are also practical items to find on the Internet, like free software that will raise your productivity and secure your computer when downloading. In this video from ThioJoe, you can learn about 5 different programs (plus one bonus) that just may change how you work today. Have a look.