Below are some links that may be of interest to those wishing to learn more about John Henry Newman:

In general:
Encyclopedia Britannica article about John Henry Newman
Wikipedia article on John Henry Newman

Catholic Encyclopedia
article on John Henry Newman
Article on Newman from Answers.com

Online texts by Newman:
The Newman Reader

Other groups and associations dedicated to the study of Newman's life and thought:
The Newman Association
The National Institute for Newman Studies
The International Centre of Newman Friends
The Birmingham Oratory

On the Oratorians, the congregation to which John Henry Newman belonged:
Catholic Encyclopedia article on the Oratory of Saint Philip Neri