In 1 Edras Michael Bird presents a commentary on this much neglected text based on its witness in Codex Vaticanus as part of the next installment of the Septuagint Commentary Series. Containing material that parallels 2 Chronicles, Ezra, and Nehemiah, 1 Esdras is featured in the Septuagint and Christian Apocrypha. The commentary presents a survey of critical issues related to the study of 1 Esdras and provides an impressive literary analysis of the contours of 1 Esdras
Though, most of us common folk cannot afford these volumes, I am glad to see this initiative continuing forward by Stanley Porter, et. al. I personally benefitted from the Genesis volume in previous research. These commentaries assist in issues of translation technique of the Old Greek/LXX and other topics that MT based commentaries naturally do not touch on. Furthermore, since the LXX holds such importance in the NT, a commentary on the LXX becomes a helpful guide to the NT exegete.
I should also mention that SBL and The IOSCS has announced a similar initiative, with proposed commentators, in 2005. I hope it will start appearing soon! I will update if I hear anything.