A good many useful bibliographies for Late Antiquity are online. If you know of others, please let me know.

General Bibliographies and Searchable Bibliographical Databases

• ORB's Select Bibliography for Late Antiquity.
• Worlds of Late Antiquity Bibliography by J. O'Donnell
• Christian Olariu maintains bibliographies of monographs and articles on Late Antiquity.
• Guide to Selected Periodicals for Classics and Related Fields at the University of Chicago Library site.
• Gnomon Online has a searchable bibliographical databank for classics, a selection from the Gnomon CD-ROM 1999.
• The library of École Française d'Athènes is now browsable online.

The Roman Empire

• The Fall of the Roman Empire, an extensive bibliography developed by L. Neuru at the University of Waterloo.
• K.H. Kinzl of Trent University has posted a selected bibliography of monographs relevant to the Late Roman Empire and a useful list of the main literary sources for late antiquity.

The Roman Military

• Late Roman Military Bibliography by Hugh Elton.
• The Development of the Roman Navy: A Bibliography by Thomas P. Roche.

Other Imperial Topics

• A Short Bibliography of Recent Studies on Roman Demography in English supplied by Thomas Anderson.
• A Short Bibliography on the Notitia Dignatatum supplied by Ralph Mathisen and Richard Burgess to the readership of LT-ANTIQ
• Bibliography of the Late Antique Economy in the Eastern Roman Empire, compiled by Steve Balestra and the members of the LT-ANTIQ discussion list.
• Late Roman Food Supply -- A Brief Bibliography was compiled by Lars Lordahl with the help of members of the LT-ANTIQ discussion list. Mr. Lordahl has now assembled a large Bibliography of Italian Land Use and Settlement in Late Antiquity and the Early Middle Ages based on the earlier one.
• Lead and the Fall of Rome: A Bibliography provided by contributors to the LT-ANTIQ discussion list. 
• A Bibliography on the Sixth-Century Plague of Justinian and its Effects, provided by LT-ANTIQ. 
• Bandits Real and Imagined in Greco-Roman Egypt, by B.C. McGing, Trinity College, Dublin. 
• Roman and Late Antique Archaeology in Bulgaria (with a brief history of archaeological research in Bulgaria) by Dr. Lyudmil F. Vagalinski. Institute of Archaeology and Museum, Sofia. 
• A Short Bibliography on Death, Grief and Burial in Late Antiquity provided by members of the LT-ANTIQ discussion list. 
• Imperial purple?  For technical information on the dye, see the Bibliography of Tyrian Purple.

Other Peoples and Countries

• Bibliography for Armenia and Georgia in Late Antiquity, provided by contributors to the LT-ANTIQ discussion list.
• Bibliography of the Ancient and Early Medieval Langobards (Lombards) by Florin Curta, University of Florida.
• Bibliography of the Gepids by Florin Curta, University of Florida.
• Recent Bibliography on the Visigoths by various contributors to the LT-ANTIQ discussion list.
• Bibliography of the Visigothic Laws and their Context by various contributors to the LT-ANTIQ discussion list.
• A Hand-List of Translated Texts for Early Medieval Spain by Mark Handley, University College London. Other bibliography can be found at  the course program page for his UCL course on the subject.
• A Hand-List of Translated Texts for Early Medieval North Africa by Mark Handley, University College London.  Other bibliography can be found at the course program page for his UCL course on the subject.

Women and Children

• A comprehensive bibliography on Women in Late Antiquity by Antti Arjava, University of Helsinki.
• A much briefer introductory bibliography on Women in Society, Politics and Religion in Late Antiquity by Jim Terry, University of Missouri.
• The Medieval Feminist Index includes material from Late Antiquity. (Note that a request for material about century 6 will also give you material about century 16!).
• Children in Late Antiquity:  A Bibliography is maintained by Ville Vuolanto of the University of Tampere, Finland.
  

Religion and the Early Church

• Recent Bibliography on the Pagan/Christian Interaction in Late Antiquity provided by members of the LT-ANTIQ discussion list.
• Bernadette McNary-Zak's Select Introductory Bibliography of the Early Church is at the ORB section for Late Antiquity and the Early Church.

The Bibliography of Evagrius Ponticus is part of the Evagrius Ponticus site.
• Selected Works on Benedict of Nursia and His Rule provided by contributors to the LT-ANTIQ discussion list.
• Jackson Bryce's Bibliography of Lactantius is an extensive work including bibliographies, editions, and scholarly literature.
• A Short Bibliography on Death, Grief and Burial in Late Antiquity provided by members of the LT-ANTIQ discussion list. 
• Selected Works on Bishops in the Late Antique West provided by members of the LT-ANTIQ discussion list.

Art and Architecture

• Early Byzantine Church Architecture in the Balkans and Crimea Fifth to Seventh Century: A Bibliography by Florin Curta, University of Florida.
• Recent Works on Late Antique Villas by Yuri Marano and Florin Curta, University of Florida.

Literary and Musical

• A Libanius Bibliography compiled by Pierre-Louis Malosse; a bibliography of his own writings on the subject, with links to abstracts, can be found here.
• Gregory Hays of the University of Virginia maintains a Bibliography for Fulgentius the Mythographer.
• The Petronian Society Bibliography on the Ancient Novel, and a searchable version of the same.
• A Concise Bibliography on the Ancient Novel from the Diotima site. This list focuses on gender issues.
• Selected Works on Ancient, Late Ancient, Medieval and Byzantine Music provided by contributors to the LT-ANTIQ discussion list.