Lafazar: I just finished the Game and made a copy of my maps. I used the walkthrough on Gamefaqs which notes almost any secret with exact coordinates, so the maps should be fairly complete.

I marked the following things as points of interest (red squares) on my maps:
-Secret Buttons/Switches
-Secret Panels
-Teleporters
-Mana Circles and Healing Fountains
-Other Points of interest (Persons/Statues/other Objects)

Further notes:
-Sometimes I marked unimportant things (like chests), so do not despair if you find nothing critical or secret at a marked location
-I did not note the locations of important objects

I hope this is of use to anyone.

Edit: Argh! GOG keeps automerging my posts (Which is a real problem because there is a limit of five images attached per post). I got around this limit by repeatedly editing this post, but just to be sure I uploaded them to tinypic also:

Slybo: I still have my old save game files. Can you believe it? This is as far as I ever got.
Small areas that look like they are missing are places where tables and other large useless objects are blocking the way.

BLUE lines are illusionary walls
BLACK gradients are stairs leading down
WHITE gradients are stairs leading up
"X" are holes in the floor
RED marks are notations I've taken. Just ignore those.

Map 1-entrance
Map 2-ruins level 1
map 3-ruins level 2
map 4-sewers
map5-mines 1
mAp6-mines 2
map7-temple entrance
map8-temple
map9-feeding grounds 1
map10-feeding grounds 2
map11-dwarf fortress
map12-faeire realm
map13-ice caverns
map14-gates
map15-pits

You may need to copy/paste the links into your browser