Emdrive – A New Concept in Spacecraft Propulsion

I've seen this come up a few times--there were a lot of stories about it late last year. It looks like hokum at first glance but apparently has some actual promise in that it has been reproduced and a -very- slight amount of thrust seems to be generated.

http://nextbigfuture.com/2015/02/update-on-emdrive-work-at-n...

Apparently the current methodology of testing chews through equipment due to requiring hard vacuum. Right now they're trying to get to 100uN of force produced so they can replicate on another system (which requires that to beat its own detection floor).

I saw this back in 2007 - 2008. I was so excited about it, even if it could only push a few micronewtons.