I am working on a couple of projects. I can't speak about them much (defense projects, largely classified) but I can say that one involves natural language processing (on small datasets , small by internet scale that is), the other involves robotics and computer vision (involves some fairly large datasets but I don't need specialized data store infrastructure).

The interesting thing about such projects is that they combine cutting edge technology with interesting users - soldiers, intelligence analysts etc - with interesting hard problems to solve. It is a different world from fixing bugs in the leasing system from hell (old time ThoughtWorkers will understand what I mean ;-) ).