Their are tons of books out their on Greyhawk. Just check amazon or something. I did a quick serch on their befor replying and found they had lots of stuff. Their is a Gazetteer and lots of adventures oh and even a box set. Also you can make up your own cities to put into Greyhawk as long as your concistant with them its ok to make your own Greyhawk campain.
I've heard of an old adnd module called 'fate of istus' and that has some information on 10 cities or so i think, but its nowhere to be found, i live in Sydney and only 3 and 3.5 ed books are in any of the shops i look in, i understand that this isnt a priority for many people but i need to get as much information on the cities as i can, so as to not later contradict myself with the geography or structure of these places which i have done so many times before. Ive asked everywhere but noone seems to know anything about it? If anyone knows anything about these books (fate of istus) etc, is it possible that anyone knows what they all are, is an inventory out of the question? I cant find the names of any of these anywhere and its frustrating me to no end, please someone help!!!!!!!1111oneone, feel free to flame me on this one, maby ive just looked in the wrong places for 4 months? Theres goto be some solid information somewhere? Thanks guys, ill try to keep things posted if anybody else is interested, thanks for your time.
Fate of Istus is still available. There are two copies on ebay as we speak, and the full text is available as a PDF product from rpgnow.com - as for detailed cities... the two most detailed are the city of greyhawk itself (which had a boxed set dedicated to it, I believe) and Istivin - which is actually detailed for 3.5e in our own Dungeon magazine a few issues back as a backdrop article (with an accompanying 3 part adventure over the course of several issues). Cauldron (from the last adventure path) also has a Greyhawk location, so you could use it as well.
My suggestion, personally, is to simply choose small towns and cities and detail them yourself. I prefer this approach in almost every campaign world, except for the truly large cities (I wouldn't want to detail Calimport in FR for example). Unless you're running an urban campaign, having detailed cities isn't really necessary. A rudimentary map will usually do, with important locations marked and a proper 3.5e city stat block. Fate of Istus (which was a bridge between 1e and 2e for Greyhawk, unless I am remembering incorrectly) does provide maps for several greyhawk cities, though not with tremendous detail.
As for questions on Greyhawk... Dungeon's resident Editor-in-chief is one of the preeminent authorities on the subject, and he might have some other suggestions for you.
- Ashavan
From what I understand, Fate of Istus is a pretty horrid resource and not worth the money.
I've always stood by Marklands, Iuz the Evil, From the Ashes and Ivid the Undying, which detail a good 60-70% of the Flanaess and her cities.
There are other resources as well, including fan created material, some of which is very good. In particular, there are some pieces on Verbobonc, Hardby, Greyhawk City and a couple of others that can be found for free, online, in the Oerth Journals.
Recently, Dungeon or Dragon also published something on Hardby, although I haven't seen it myself, people have raved about it. You might also be able to get some back issues of either magazine that have the Living Greyhawk Journals in them, some of which had details on other cities around the Flanaess.
As for hard copies of Marklands, Iuz the Evil, From the Ashes and Ivid the Undying, good luck. I've looked and only ever found exhorbitantly priced offerings on ebay or The Hit Pointe and Noble Knight. From the Ashes regularly fetches up to $100 US.
I would KILL for a re-printing of these. Oh, and Ivid was never published but can be found online for free from WotC's website, although I recommend looking for the edited PDF version of it which is much easier to navigate, read and print, but isn't on the WotC site.
Speaking of PDF's, that's probably your best bet when it comes to Greyhawk material. There are legal ones from RPG Now, but the quality is atrocious. Sad to say, but you're better off getting the technically illegal versions, if you can find them. They ARE OOP after all.