I met him (and Shatner) at Dragon Con a few years back and I even got his autograph, too, but I gave their autographs to a dad friend of mine who is a huge Trek fan too, but who had to stay home and watch his son. I remember when I met Nimoy, he seemed really tired and old, and just looking at him I was worried that he was in his twilight years. It was about that time he went public with his COPD that would eventually kill him. So when he was hospitalized, I had a sense that this could be it.
I'm thankful for all the great shows he brought us, from Star Trek to science documentaries and that hilariously unforgettable Ballad of Bilbo Baggins. I'm grateful I had a chance to speak to him, if only briefly.
(Mod note: I'm merging the two Nimoy threads.)