grodog
Hero
Here's a thread on dragonsfoot where someone posts their excellent photoshop made maps. They just get better and better as the 24 pages of the thread goes by:
http://www.dragonsfoot.org/forums/viewtopic.php?f=31&t=27578
There are also some good dungeon maps posted in the various megadungeon design threads on DF, K&K, and Fin's OD&D boards; see the index @ http://odd74.proboards76.com/index.cgi?board=adventures&action=display&thread=197
I also have maps of some of my levels for my version of Castle Greyhawk posted to my site @ http://www.greyhawkonline.com/grodog/gh_castle_grodog.html