Any Anti-Glare screen protector will do it.
I had the Switcheasy one on my iPad 1 and it was great, but whenever I saw another iPad without a screen protector I could really tell the difference, Naked iPads are much clearer and crisper. However, the feel of the screen is a bit better with an Anti-Glare protector, and its a little better in sunlight, but don't get your hopes up if its sunny you still won't see anything on the screen.
I'm waiting for my iPad 2 to arrive, and this time around I will not be using a screen protector as I have decided that screen clarity is more important to me than a slightly improved feel.
But again, that will most likely solve your problem.