FourLetterWurdz

Okay, I've just gotten Photoshop CS3 today. I've been bumbling around with it, reading tutorials, and all that. Somehow, my brushes have gone from black, to white. I'm not sure why, or how, but everytime I create a new document, and start brushing, it's still white. I've set it to 8-bit, and all that mumbo jumbo. Is there an easy way to fix this? Doesn't really seem to be an easy option to set a certain color..