Hmm. games back in the quake 2 days used to use pain skins to show damage on models.. for some reason you don't see that much these days. I guess they mostly use decal textures instead now, but the advantage of smethign like pain skins was that you could have 3 set levels.. which would give you a good idea how much damage you'd done.
Though of course those used to work better for ai grunts than for players.
I like the way recent games have altered the viewpoint to indicate things like damage, sneaking, speed kills, etc..
What was the game where the screen faded to Black and WWhite the more damage you took? That always seemed a cool idea to me.
Playing: Link to the Past, Astroboy, Kario Kart, Mario World (Micro) KOTOR 2: Sith Lords (Xbox) Morrowind (PC)