I would add a good NiMH battery charger to CK's list. No need to get anything too fancy or expensive, but it's pretty important with digital cameras because these are power-sucking devices.
Other than that, I find that the best way about photography to learn is to go out there and shoot lots of exposures, come back and critique your own work, and then ask the experts about your mistakes and problems. Reading up on the technical aspects and viewing the work of the 'great photographers' certainly won't hurt either. All the best.