In 2013, we had over 20,000 natural and artificial satellites, from operational satellites to space junk - even a pair of orbital gloves.
Some scientists are worried that future space travel might be too risky if we get too much junk orbiting the planet. We might seal ourselves inside a shield of shrieking metal moving at 29,000 Km/h." Fraser Cain
Some of these satellites can be tracked by http://www.n2yo.com/satellites and others are just not represented, although it is believed that the United States Space Surveillance Network (SSN) and Space-Track have the most accurate numbers.
A plugin available for Google Earth now allows you to view 13,000 of these satellites which is available at http://www.gearthblog.com/satellites. Alternatively, you can watch the video below on Youtube:
There is also a great 3D tool available on Spacebook, but it does require Google Earth to be installed on your computer to have a look and play interactively available at: http://apps.agi.com/SatelliteViewer/
Either way, it is a very real situation, and if we do not plan accordingly, we might find ourselves in the near future unable to even leave this little hunk of rock we call Earth.