On hairball remedies, I try to give Bo hairball remedy treats once in a while. She eats Science Diet Feline Maintenance formula and is doing very well on it. I like Science Diet because it doesn't contain coloring agents or nasty fillers.
Spencer's recommendation to brush your cat at least once a day is good. Sometimes during the summer I have to brush Bo twice a day, fortunately she LOVES to be brushed and will beg to have it done.