As some of you are aware -- Jack has been tracking down player's addresses for years and he produces a very popular (within our hobby) book with that and other autograph tips. The NY Times (registration required) ran a story on him recently. He also used to send out a card price list and I kept buying from him back in the day as he became a source of 1969 White Letters for me.
http://www.nytimes.com/2009/08/11/sp...r=1&ref=sports