Inverse Transit Method
If a telescope can be built that detects the slight drop in emissions from a star as a planet transits, then it might also be possible to do the opposite:
Build a telescope that detects the slight increase in radiation from a star system when a planet is off to one side, reflecting even more of the star's light in our direction. This method should hugely increase the number of star systems that can be searched for planets.
By the way, the terminology "Inverse Transit Method"... I just thought of that. It's mine! All mine! Just kidding.