If I were in the Matrix the skill I would want to download would be to fly. Think about it, I could escape any situation. In the middle of an awkward situation with some one I barely know? No problem, I could just fly away. I wouldn't even have to wait for traffic! I think every one has at least thought about flying once, and I could finally know what its like. Its just a great all around skill that i would probably use on a daily basis.