Let me give you a little lesson, here. A lot of the previous posts have been good ones, but let me rephrase all of them into an advice for ALL cat owners, whether their cat is aggressive or not.
-Do not play aggresive games with your cat
-Regularly clip it's nails. Only with white part, the pinkish part has nerves, and it hurts
-When the cat is being aggressive, make a warning the first time. A loud 'Shoo!' and a shove will usually do the trick. The second time, grab the skin in it's neck (you know when the mother moves 'em, the part she bites into to pick it up? That's the part I'm talking about), and, whilst holding it like that, speak to it in a stern manner. It doesn't matter what you say, the intonation of your voice must say:"I'm dominant, and I don't like what you just did." When the cat's calmed down, put it on the ground
-Cats like to be tickled or pet(ted?) under the chin, near the ears (the fluffy part right before the opening) and when it really trusts you, the belly or just on the side of the eyes
If you ever have a question about a cat, contact (PM) me. We've got a cattery over here, so I know a lot about them

. Good luck with your kitty.
