It was stated by someone yesterday that b&w is nice for the "abstract" character it provides.
I use b&w for the sense of texture it provides. http://www.photocritique.net/g/s?zzoQwn-p13184249 http://www.photocritique.net/g/s?zzohTn-p13184249 (which is why I also like larger formats for color) Why do you use b&w?