I have lived with a black cat ever since he was a kitten, (he's sleeping on my bed as I type this) and after 14 years (and counting) he has been my best friend. If anything that black ball of fluff and stuff has brought me only good fortune. (except when he jumps on me in the middle of the night for petting, and all I see are a pair of floating yellow eyes in the dark... Needless to say, it's a little unsettling at first)
I had two cats, Midnight and Probert, They were twins. Both black cats, and they did everything together but when Midnight died Probert would cry *as in like sad howling* every night until Proberts liver failed.