Japanese researchers have developed a what I call a MIND BOGGLING technology of reading a human's mind, which can be transcribed into images. Basically, what they did was to take an image of brain activity taken in a functional MRI scanner, re-creating a monotone image from scratch.
This technology would be great if put into good use and could spell disaster should it be fall into evil hands. Military covert operative might have to be re-trained all together on enemy captures and etc. However, if put into good use, this technology could also help us uncover our true innerselves through the dreams we make, or allowing the physically and/or visually impaired to be better understood.
More about this could be read at http://www.newscientist.com/article/dn16267-mindreading-software-could-record-your-dreams.html