Delta has increased its checked baggage fees, effective today. Your first bag now costs $23 and your second, $32, up from $15 and $25, respectively.
I never check bags now if I can help it. Eventually that new piece of carry-on luggage I bought will pay for itself in saved fees, and at the rate the bag fees are going, sooner than later.
Delta hikes baggage fees again [AJC] (Thanks to Gary!)