Loved him and also, Jonathan Winters before him, when the two of them were together they were light years ahead of us and screamingly funny . Many years ago I took a road trip to the west coast. When in LA, I went to the Improv Comedy Club one night and sat 10 feet from the stage and lo and behold Robin Williams made a surprise appearance to try out new material. He was brilliant. Will really miss him.
http://www.youtube.com/watch?v=iDJjq0Pd0RM
BTW, it was reported by his wife, that he was recently diagnosed with early Parkinsons, something i share too.