LEFT 4 DEAD!!!!1
Oh, guess that one is kind of obviously a zombie game, isn't it?
You can add Oblivion to your list, it has zombies. Fallout 3 also has its "zombies". Even a mission called, "You have to shoot them in the head" referencing the classic method for killing zombies.
Kind of funny to see Half-Life on that list, since the zombies were one of the most striking things about the first game (which was intented to be a horror game); but now when most people think of Half-Life, they think about Half-Life 2, which left its horror roots behind and became more of a sci-fi action game. With the exception of Ravenholm, the zombies play a much smaller role in that game and its expansions.
For anyone who has somehow not played the original Half-Life, I'd like to take this moment to highly recommend it. If you can get over the 10 year old graphics (can't believe it has been that long ago!) then you are in for a really enjoyable experience. As much as I love HL2, I can't compare it to the greatness of the first one.
Those "zombies" on Zelda use to really freak me out. Not because they look scary, but because of the whole atmosphere around them, they way they'd shriek, come at you in slow motion, jump on you, and start humping you.