Revelation (3 vol)
Word Biblical Commentary
David Aune
Word Publishers, 1997

Incredibly detailed and specific.

Revelation: the Apocalypse of Jesus Christ
Judith Kovacs, Christopher Rowland
Blackwell, 2004

The emphasis of this series is upon the history of interpretation of the text. With Revelation this is particularly insightful due to the varied meanings people have given to this text. They make a commendable effort to organize the varient approaches and show the limitations and insights of each.

The Book of Revelation (NICNT) (Revised edition)
Robert H. Mounce
Eerdmans, 1998

Detailed.

Revelation (Continental Commentaries)
Roloff, Jurgen
Fortress Press, 1993

A strong representative of the old school commentaries.

A Handbook on the Revelation to John
Robert G. Bratcher, H. Hatton
United Bible Society, 1993

A guide for those translating the Bible.