USA demonstrates ability to shoot down a satellite

Last night the U.S. shot down a defunct spy satellite with a ship-based missile.

http://www.space.com/news/080221-satshot-transparency.html

Video of that event including the "hit".

http://www.space.com/common/media/video/player.php?videoRef=080221-satellite-kill

One way to avoid the risk of being shotdown is to use many smaller networked sattellites that are cheap and easily made and launched, like Cubesats.