SMAA is a powerful alternative for FXAA and similar post-processing anti aliasing techniques. Some of the new features include local contrast analysis for more reliable edge detection, and a simple and effective way to handle sharp geometric features and diagonal lines. This, along with the accelerated and accurate pattern classification allows for a better reconstruction of silhouettes. Also it looks much better for scenes in motion.
Check out the video below for a comparison with several other algos. The video is also available as a download in better quality.
Sources are available from Github.
The paper together with all of the above resources is available from this website: http://www.iryoku.com/smaa/