A scholarly article analyzing the religious background of the influential Christ hymn of Philippians. Posted by David Seeley of the Institute of Higher Critical Studies at Drew University.
Although this Web site is geared toward providing informed resources for Christian preachers, the lists of Scripture passages in these tables are linked to rich lists of resources from all around the web. This is an excellent site for finding what relates to a particular Scripture passage.
This is the online version of the well-known Catholic Encyclopedia. Though somewhat dated, the article still gives a very clear, accessible introduction to Philemon. It is also heavily hypertexted, allowing the reader to explore other issues elsewhere in the encyclopedia.
Online article by James Dennison of Westminster Theological Seminary analyzing the role the concept of slavery plays in the theology of the Book of Philemon.