Phil Johnson's Bookmarks - Christian and theological links, with ratings and commentary from a Calvinistic Baptist perspective. - http://www.spurgeon.org/~phil//bookmark.htm
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/
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/
Believer's Web - Collection of articles with searchable index. - http://www.believersweb.org/
DataRat Theological Glossary - Extensive theological dictionary from a Reformation perspective. - http://www.datarat.net/DR/FramesLexGloss.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/
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
Theology Links - Links to theologians, online texts, journals, essays and papers, and organisations. No annotations. - http://www.fambof.nl/links/theology/
The Threshold - A navigation tool for finding theological resources on the web. Calvinist. - http://www.monergism.com/
The Irish Theological Association - An annotated list of theological resources, split into about 20 categories. - http://www.theology.ie/