Of additional interest would be the other DARPA programs participating in the open catalog, of which MEMEX is but one.

http://www.darpa.mil/opencatalog/

There are many interesting 'pieces of the puzzle' here that you can glue together to make something awesome.

If anyone cares about what success means in our case, it's the transition of technology to other agencies and companies (not necessarily military!). We want the research funded here to live beyond the program instead of dying when the program ends (truly satisfying from a Software Engineering perspective, where many R&D deliverables are either too specialized or never see the light of day)