This is a very simple and brilliant visualization of all planets known to humankind as of June 2012. There are 786, including the eight in our Solar System, which is shown in the gray square in the center.
First, it's really amazing that we have detected so many already. The number is growing really fast now, but soon the figure will really start exploding. What's better: we are now getting good at detecting tiny planets like our Pale Blue Dot.