The kitchen linked below (black kitchen cabinets) is in a home that has all black doors. It is very pretty. You can search the architects website to see the rest of the home:

Here is a link that might be useful: Black Tie Kitchen

I adore black painted doors as well as black painted furniture but it has IMO a major downside and that is that dust shows very quickly on it. My black glass-topped stove needs daily dusting every morning! And my painted black kitchen cabinets need much more frequent wiping than I've ever done with wood tones or other color cabinets. I don't even live in a dusty area, can't imagine the extra work if I did.

If you don't mind the maintenance and love the look I say go for it!

If you plan on moving from that house, black doors will definitely hurt resale opportunities. I would not touch them with paint...but them I really like original woodwork in FourSquares. I stripped the paint from 7 doors and all the trim in the hallway the doors entered to.

i'd modify the shade of paint to get a color that blends well with the wood.