Vowing to never charge again lasts...until the first time you need to rent a car, book a hotel, pay for something from an online store that doesn't take PayPal or fork out a $6 ATM fee to get cash.
Vow to get financially savvy. If you're overspending via plastic, you're overspending in general. First, get a sense of what you have and what you owe. Then, with the effects of the recent economic meltdown in mind, figure out if you need to start paying off your debt or beefing up your emergency savings.