Let me start by saying that I'm completely ignorant of most of the stuff I'm going to talk about, this is just an idea I had...
I just read the Sky & Telescope September issue and one article caught my fancy. The article, X-raying Planetary Birthplaces ( page 17 ), explains how a team of scientists used the Chandra X-ray Observatory to distinguish between stars that have dust disks around them and those that don't.
I don't know if the current theories on planet formation allow dust disks to still be around once the planets are formed, but if so, could this new method be used to pint-point possible candidates for solar systems? Using Chandra, we could separate stars who have dust disks around them from stars who don't. Those who have dust disks possibly also have solar systems, and could be targeted for further study using the other methods for planetary discoveries ( I have no idea what those other methods are, though... )
Once again, please remember that this is just an idea from the top of my head. I have no idea if it would work, but it would be neat if it did, wouldn't it?