There are sadly very few links related to Jack and his crew. Here are the ones I find most noteworthy:
http://www.jackbenny.org
This is a great site and the web headquarters of the International Jack
Benny Fan Club. Highly recommended.
http://www.kcmetro.cc.mo.us/pennvalley/Biology/lewis/crosby/harris.htm
This is actually a long obituary on Phil. Sad but
informative.
http://www.lofcom.com/nostalgia/phorums/list.php?f=11
This actually is a place where Jack fans can interact with each other in a
Web-based bulletin board format.