Otherland -- City of Golden Shadow by TadWilliams (http://www.tadwilliams.com). A fantasy novel caped in CyberPunk. 770 pages, first of four (long) novels. ISBN 0886777631 .
I'd review it, but I'd just be repeating what I said on MeatballWiki: http://usemod.com/cgi-bin/mb.pl?OtherlandCityOfGoldenShadow -- SunirShah