Rocketeers.co.uk - a British view of commercial spaceflight

The EmDrive, the "reactionless" electromagnetic thruster devised by Roger Shawyer of SPR Ltd. is gaining wider coverage, and discussion of the replication work being performed by a Chinese university.

• China will build controversial Emdrive, experimental system should be ready by end of 2008 -- Next Big Future
• Chinese say they're building 'impossible' space drive -- Wired Blogs
• China takes the leap: Emdrive aka Infinite Improbability Drive now in development -- Engadget

Rocketeer comments: Here's my take on it. It "works" after a fashion (actually generates thrust), but not in the way that Shawyer thinks it does. It's actually a form of Asymmetric Capacitor Thruster (ACT), which generates thrust by the Biefeld-Brown effect -- charged metal surfaces ionise the surrounding air by corona discharge, and create an '"ion wind" which pushes the apparatus along. Good for the continued integrity of the laws of physics, but bad for space applications of the EmDrive, because in a vacuum it would do precisely nothing.

Here's an interesting NASA paper: Asymmetric Capacitors for Propulsion.