The Irish Times has reported some information on IBM's Dublin involvement in the development of Watson. You remember Watson, don't you? It's the IBM system that beat two very skilled human contestants on Jeopardy! about a year and a half ago.
While the hardware of Watson is outstandingly impressive (about 90 Power Systems 750's, 2880 processor nodes and 16 TB of RAM), the software of Watson is what stole the show. The ability for a computer to analyze incredible amounts of data and then provide the question to the answer (if it's confident in it's response) is now being utilized by healthcare and other industries to provide invaluable services for the future.
One of the nice little tidbits in the article is that the language analysis technology for Watson had been developed out of the spell checking system for another well known technology years before.
The name of that technology? You guessed it.
IBM's very own Lotus Notes.