Also, keep in mind that your credit limit will increase if you keep up on all of your payments, and that isn't necessarily a good thing, because your "potential debt" will increase, thus hurting your credit.
My first credit card limit was $250. A few months ago I learned that it went up to $2k. I canceled it and got a new one. The new one is cool; 0% APR until April 2005, $1500 credit limit, and it has the democratic party's logo on it