Selective use of color in an otherwise black and white shot is cliche -- but it is still useful because color provides a powerful spotlight on what the photographer wants to highlight.
Here are a couple of examples, one taken at Lassen National Park (Nikon D200, 18-200 vr at 18mm, f/8) and another in downtown Santa Cruz in front of a favorite burrito shop (Nikon D300, 30/1.4, f/5.6). I like their tubular tacos. Both shots were processed with Capture NX and Silver Efex using the latter's control points to selectively reveal the color of the original.
Today, in anticipation of sunnier weather, I swapped the winter wheels off the Mini for summer wheels. Mind you, I'd be happy to run the winters all year. This is Canada after all. But I figure that since I own the summer set might as well spread out the wear. And the summers look better.