It might be a bit strange looking at first glance, but the Jones Loop H-Bar offers many different hand positions, making it an ideal bar for touring and mountain biking.

From the Jones Bikes site: These bars may look unconventional but the bottom line is that they flat out provide better handling and more comfort than a traditional bar. A wide range of better hand and body positions ensure more power, comfort and control. 45 degrees of sweep puts your wrists in a natural and relaxed position for lasting comfort.