Regrettably, I never had the privilege of knowing Mr. Conover and to my deficit, didn't know a lot about him.
However, after reading these tributes and taking the time to view more of his work, I can plainly see he was a beloved friend and a unique, powerful entertainer.
For those who didn't know him but wish to know more about Mr. Conover, there is a good article in Genii Vol 58, pg 653-ff (July 1995)
Here is some more video of Mr. Conover in action: http://www.mentalist.net/video.html
Finally, the characteristics of the stack Mr. Anderson references above are mentioned in Genii, September 2004, pg 89.
My sincere sympathies to his family and to you, his friends.