Astronomers for the first time can actually show evidence of a planet in another solar system. All the announced planets thus far are inferred based on slight perturbations of starlight. But these new methods use actual telescopes and photography methods that not only show the planet but also it's orbital movement over time.
http://www.nytimes.com/2008/11/14/science/...amp;oref=slogin
http://www.astronomy.com/asy/default.aspx?c=a&id=7599