This photo was originally a full color photograph, but I edited it in Photoshop CS5.
You can get some nice black and white tones on a lot of consumer level cameras (you just have to play with your shutter speed, ISO and f-stops until you achieve the look you're going for).
This particular photo (my cat) isn't a true black and white photo though. It is more grays and dark navy (blue) tones. As far as I know, no camera can achieve that color combination on its own (without the help of customized filters).