This is one of the best sites for getting information about the whole range of religious beliefs, what all kinds of different Christians think (or other religions); I use it quite a lot.
A few other good sites:
http://www.utoronto.ca/religion/synopsis/
Five Gospels Parallels - gives 4 canonical gospels and Thomas, with Paul. Very helpful to see how the gospels match and differ, and where Thomas or Paul's letters have similar material. The parable of the sower is a good example. Very easy to use.
http://www.religion-online.org/
As the blurb says: "More than 6,000 articles and chapters. Topics include Old and New Testament, Theology, Ethics, History and Sociology of Religion, Communication and Cultural Studies, Pastoral Care, Counseling, Homiletics, Worship, Missions and Religious Education.". Listed by topic, and searchable. Some very good articles on online books.
http://www.ccel.org/
Christian Classics Etherial Library - includes pretty well all the early church fathers to AD 325 (http://www.ccel.org/fathers.html); Chesterton, Augustine, George Fox, St Ignatius, William Law, Brother Lawrence - to name but a few of the a whole range. And hymns, and hymn tunes, music etc.
http://www.ntwrightpage.com/
Tom Wright in many ways is the spiritual heir of C.S. Lewis; his "Simply Christian" is a "Mere Christianity" for today. This site contains writings, articles, sermons, downloadable MP3 lectures, translations into French, Spanish, Portuegese. It is "unofficial" only insofar as the webmaster does not want emails addressed to the Bishop coming to him, but Tom Wright endorses it as the place to see his stuff online.
http://ntgateway.com/
Mark Goodacre's New Testament Gateway ("the award winning web directory of internet resources on the New Testament, currently being updated daily. Browse or search annotated links on everything from the Greek New Testament to Jesus in Film."); his blog is also worth a look at to.
