The Irish Theological Association 
An annotated list of theological resources, split into about 20 categories.
http://www.theology.ie/Monergism 
Classic articles and resources of the historic Christian faith. A navigation tool for finding theological resources on the web. Calvinist.
http://www.monergism.com/
The Online Theological Research Library 
One (very) long page with links categorised by subject area.
http://www.angelfire.com/jazz/theological/
Theology Links 
Links to theologians, online texts, journals, essays and papers, and organisations. No annotations.
http://www.fambof.nl/links/theology/
University of Pennsylvania Library: Christianity 
One large page of the most important links.
http://oldsite.library.upenn.edu/resources/subject/humanities/religion/xian.html
Fides Quaerens Internetum 
One of the earliest guides to Christian theology on the Net. Small. Leans toward institutions (schools, libraries, societies). Kept up to date, but almost no description of links.
http://people.bu.edu/bpstone/theology/theology.html
Computer-Assisted Theology: Internet Resources 
Annotated directory. Strong on Biblical studies, historical theology, individual theologians, and publishers. Highlights best resources and new additions. Could take a minute and a half to load.
http://users.ox.ac.uk/~ctitext2/theology/
Believer's Web 
Collection of articles with searchable index.
http://www.believersweb.org/
Biblical Worldview 
Directory of authors, speakers, books and ministries that in the opinion of the site's authors teach a Biblical and Christian worldview.
http://www.christianworldview.net/
BILDI 
[German, English] Search engine for texts, monographs, and journal articles. Provided by the School of Theology at University of Innsbruck.
http://www.uibk.ac.at/bibfu/bildi/
Phil Johnson's Bookmarks 
Christian and theological links, with ratings and commentary from a Calvinistic Baptist perspective.
http://www.spurgeon.org/~phil//bookmark.htm
Catalogue of Articles 
Collection of articles by leading theologians and philosophers.
http://brandon.multics.org/library/