The exsistence of IBM’s Deep Blue How would IBM’s Deep Blue fair against modern day champions like Carlsen? Was it decommissioned after Kasparov's game?
The match with Kasparov was very close - 3.5 - 2.5 and it is arguable that Kasparov's loss was due to psychological factors. Until Carlsen's recent disastrous tournament where he went to pieces psychologically after over stepping the time control in round one I would have said that Carlsen is psychologically stronger than Kasparov but now I'm not so sure. 

Modern day players like Carlsen have closed the gap that existed between Kasparov and the rest without opening up a big gap. I want to say that Carlsen would beat Deep Blue but I suspect the truth is that it would be a close match again.

Deep Blue was dismantled and parts of it can now be seen in two different US museums - http://en.m.wikipedia.org/wiki/Deep_Blue_(chess_computer).