help!

okay, i've been searching for hours and can't seem to find what i need to find. so, i'm posting here for help. i'm trying to do the color and black and white effect. and i was wondering how to do that. i'm using photoshop cs3. if there are any suggestions or tutorials that you know of that i just didn't find then please, please, please let me know and i'd love you forever!

thanks again!