One of my desk mementos is a IC card that Japan Rail issued on the occasion.
March 18, 2007 was the first day you could use a Pasmo card on Suica systems (and vice versa). [Twitter user SBSdroid informs me that this was because 3/18/2007 was the first day of PASMO. I had thought it was around in 2006, but no.]
How much easier traveling around Tokyo became, when you didn’t have to carry two separate cards!