Just remember, use it every month and pay it off every month!!
(Actually, you might want to try alternating-put $50 on it, pay $25 for two months, then pay it off in full for a couple of moths, then pay half, etc...The thing is, as I think I said, your credit scores are better when you pay off every month...but the credit card companies want to make money off of you, and they don't if you pay in full every month. Especially now that things aren't going so well in the credit card industry, they'll stick an annual fee on your account quick as looking at you if you don't pay any interest!)