One word about post-processing - black and white images look their best when they are sharp, contrasty, with a wide range of tones, and my personal favourite is when they have some grain. Sometimes a little bit of digital noise looks good, although technically, it's not really the "grain" that we think of when we think of B&W. That grain derives from the film days.
And if you're using a photo editing software like Lightroom, iPhoto or any of the other Photoshop CS softwares, you can always play with the red, green, orange, yellow and blue filters that will change the hue of the B&W image. Or, add a sepia, creamtone, cyanotype or selenium filter to transition your B&W image to a whole new level.