The Message of Isaiah (Bible Speaks Today) Dr. Barry G. Webb offers a thoroughly readable introduction to Isaiah. It is scholarly but avoids a lot of technical jargon and detail.
The Fifth Gospel: Isaiah in the History of Christianity This is a fascinating survey of the book of Isaiah's contribution to Christian theology and history.
The Book of Isaiah, Chapters 1-39 (The New International Commentary on the Old Testament) Dr. John N. Oswalt's commentary on Isaiah is outstanding in its combination of conservative scholarship with rich spiritual insights.
The Book of Isaiah, Chapters 40-66 (The New International Commentary on the Old Testament) Dr. Oswalt examines Isaiah, Chapters 40–66 in the New International Commentary on the Old Testament series.
The Book of Isaiah (3 Vol. Set) Dr. Young's commentary has represented the gold-standard in conservative Isaianic scholarship since its original publication in 1965.
Isaiah (Tyndale Old Testament Commentaries) This thoroughly readable and affordable introductory commentary is an ideal entry-level text to Isaianic scholarship.
Word Biblical Commentary: Isaiah 1-33 This volume on Isaiah 1-33 by Dr. John D. W. Watts meets the high standards of the Word Biblical Commentary series.
Word Biblical Commentary: Isaiah 34-66 In this volume Dr. John D. W. Watts examines Isaiah, chapters 34-66.
Isaiah, Vol. 1: Chapters 1-39 (Westminster Bible Companion) Dr. Walter Brueggemann is a refreshingly original Old Testament scholar. His work reflects the concerns of liberation theology.
Isaiah (Westminster Bible Companion) (Volume 2, Chapters 40-66) This is the second volume of Walter Brueggemann's engaging commentary on Isaiah.
Isaiah 1-39 (The Anchor Yale Bible Commentaries) For readers looking for a more liberal theological perspective, this set in the Anchor Yale Bible Commentary series is a must.
Isaiah 40-55 (The Anchor Yale Bible Commentaries) (Volume 19A) This is volume 2 in Blenkinsopp's outstanding commentary on the book of Isaiah. In this volumes he examines chapters 40-55 or "Second Isaiah."
Isaiah 56-66 (The Anchor Yale Bible Commentaries) This is volume 3 in Blenkinsopp's outstanding commentary on the book of Isaiah. In this volumes he examines chapters 56-66 or "Third Isaiah."