Wilson, Mark W. Charts on the Book of Revelation: Literary, Historical, and Theological Perspectives. Kregel Charts of the Bible and TheologyGrand Rapids, Michigan: Kregel Publications, 2007. 136 pp. RRP $14.95.
This book seems to be a helpful one if you need to get an overview quickly. You can take a look at its content at Kregel Books (see especially the 32 page pdf-file) or at Amazon.
It is recommended here by Dr. Alan S. Bandy at his Café Apocalypsis.
Update: See also Review by Jan G. van der Watt in Review of Biblical Literature
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You can obtain copyright free maps (and I think they are fairly good, if I do say so myself) of the seven churches of Revelation and Patmos here at the
BibleMapper wiki</a.
[quote comment=""] … I think they are fairly good, if I do say so myself… [/quote].
Indeed.