I like the look of barn doors, i.e., with the exposed track above the door opening that the door travels on. But I don't really know how such doors would be truly practical. For one, I don't think they can close the opening completely (am I right?), and second, it seems to waste a lot of wall space. The latter may be less of a problem if I think of the door and its mechanism as a piece of art it self; then I wouldn't need to hang pictures on the wall ;-)
Some of the urls I looked at...
http://www.crown-industrial.com/index.htm
http://www.bartelsusa.com/
http://www.mytscstore.com/webapp/wcs/stores/servlet/DisplayCategory_10551_10001_120409_14258__14239|14249|14258
http://livemodern.com/forums/materialsmethods/619451818
http://www.barndoorhardware.com/index.htm
http://www.nextag.com/barn-door-track/search-html
http://apartmenttherapy.com
