http://news.yahoo.com/s/livescience/20080311/sc_livescience/tinybrainlikecomputercreated Unlike normal transistors, with settings of 0 and 1, these new molecule-sized transistors have 16 setting, much like a brain nueron with branches.
"Since the central molecule can simultaneously control 16 other duroquinones, mathematically this means a single pulse at the machine can have 4^16 - or nearly 4.3 billion - different outcomes."
And you know what, most "hard SF" writers would've complained mightily if they'd seen this sort of technology in an SF book last year, and called it "SciFantasy".