I continue to add links to articles and books to my resources pages. Among the most noteworthy additions are:
Bauckham, Richard. "Monotheism and Christology in Hebrews 1." Pages 167-85 in Early Jewish and Christian Monotheism. Edited by Loren T. Stuckenbruck and Wendy E. S. North. 2004.
Blair, Merryl. "'According to the Order of Melchizedek': Hebrews 7 and the Priesthood of Christ."
Colijn, Brenda B. "'Let Us Approach': Soteriology in the Epistle to the Hebrews." Journal of the Evangelical Theological Society 39.4 (1996): 571-86.
Decker, Rodney J. "The Warnings of Hebrews Three and Four." Journal of Ministry and Theology 5 (2001): 5-27.
Gleason, Randall C. "Angels and the Eschatology of Heb 1-2." New Testament Studies 49 (2003): 90-107.
Irons, Lee. "Entering God's Rest by Faith: Realized Eschatology in Hebrews 3:7-4:11." 2007.
Kobelski, Paul J. "Melchizedek in Hebrews 7." Pages 115-29 in Melchizedek and Melchiresa'. 1981.
Koester, Helmut. "'Outside the Camp': Hebrews 13.9-14." Harvard Theological Review 55 (1962): 299-315.
Wallace, David. "The Use of Psalms in the Shaping of a Text: Psalm 2:7 and Psalm 110:1 in Hebrews 1." Restoration Quarterly 45 (2003): 41-50.
Welch, Charles H. Perfection or Perdition: An Exposition of the Epistle to the Hebrews. 1973.
I have also added links to some public domain commentaries (A. W. Pink, Robert Jamieson, B. W. Johnson, Matthew Henry, F. B. Meyer etc.) for the sake of completeness.