What I'm enjoying most about Dishonored is the countless new discoveries I make on each replay.

For example: Granny Rags. After first visiting her and she goes out the back of her apartment to feed her birds, did you watch her through the key-hole and see the 'birds'? I didn't do this until a later play-through, and realised I'd missed a real big hint about what was to come (or at least saw just how frighteningly batty she really was)! I loved this touch.

Talk to Cecelia for long enough in early levels, and she will eventually trust you sufficiently to tell you that you can have the key to her abandoned apartment (and where the key can be found if you missed it). Not all that exciting really, but I didn't discover this until today and only ever landed in her apartment towards the end of the game.

Using the heart on Wallace eventually uncovers that he's a traitor to his neighbours.

It's all mostly small details, but I just love finding them!