Just in case you didn't already suspect that there might be other planets out there, NASA Kepler researchers have found the smallest rocky planets to date. The three small extrasolar planets are all smaller than Earth, and are circling a red dwarf, which is the most common type of star in the milky way. This suggests that there may be many more planets in our galaxy than originally thought, and possibly even more planets than stars.
Planets seem to be everywhere. See the full Nature and AP links below.