Most mainstream Christian churches don't have anything resembling a formal interpretation of the Revelation of St. John. The text has been influential in various ways, and there have been diverse opinions and interpretations.
The book is the most controversial in the New Testament Canon; that is probably somewhat obvious. But this is also simply the case historically. Its general acceptance took a very long time, especially in the East where even as late as the 7th and 8th centuries it still was contested. In fact, the Revelation doesn't have a place in the regular proscribed lectionary readings in the East even today.
The influence of the text can be seen far more in Christian art and liturgy, rather than theology proper. That is, the images and imagery within the text have influenced elements of Christian worship and devotion, without anything resembling an established interpretation of the text. And private interpretations, especially of the Revelation, have generally been frowned upon because it is incredibly easy to get lost into all kinds of kooky ideas reading the text without any real background in the history of the text or biblical exegesis in general.
Churches with a more vested interest in having a more formal or definitive interpretation of the text generally have only come into existence recently in a post-Protestant Reformation world.
Over emphasis, or obsession, with the book is very dangerous; and my general recommendation for most people who are generally unfamiliar with the Bible, perhaps reading the Bible for the first time, or simply don't have much knowledge (especially about this particular book) to not concern themselves with it. I think there is value in reading the text, but it's extremely easy to get confused, or get some pretty bizarre ideas (I recently saw someone try and argue that since the text mentions Jesus on a white horse that there must, then, be white horses in heaven)--or at least get a really big headache.
For all intents and purposes, I'd say it's one of the least important books in the Bible, I would recommend someone read nearly any other book of the Bible a thousand times before I'd ever recommend someone just dive head first and blindfolded into the wild and wacky world of the Revelation.
-CryptoLutheran