Fairwheel Bikes, a distributor out of Tucson, AZ has developed in-house a “brain” for communicating drivetrain controls via Shimano’s Di2 electronic shifters. Built on a ti Titus 29er, the brain of the system is housed in the stem.
Using the new Shimano Di2 shifter button setup to shift the rear derailleur.
The brain takes care of the front derailleur. When you get to the smaller cogs of the cassette, it will shift into the big ring for you, and bump the cassette back up a cog. Or whatever it “thinks” would be best for the given situation of effort. Same thing in reverse; start shifting up the cassette and it will drop the front back into the small ring and adjust the rear derailleur into the gear it has decided that would be best for you. And your family. And the world. Harmony through better computing. 
More info:
http://fairwheelbikes.com/cycling-blog/custom-bikes/titus-di2-project-29er.html
Pingback: Tweets that mention Interbike 2010 » Blog Archive » Di2 with a brain. -- Topsy.com
Best of Interbike that I have seen.
How to you up the big S.
Shimano’s lack of progressive innovation with Di2 to both XTR, XT and Ultegra is just…..well lazy and sorry.
There goes that many more customers to Sram.