Ritchey's Comp Bar Ends are fantastic for additional leverage on steep climbs, and for giving your hands another gripping position. Also, the angled clamp slots reduce stress on bars, so these great bar ends work with aluminum and carbon handlebars.
Add another hand position to your bike with Cane Creek's Ergo Control II Bar Ends. They're ergonomically designed for exceptional comfort and control. They have a rubber surface that offers a soft, secure grip and is wrapped around a composite skeleton with an aluminum clamp. The mounting point is in the middle of the bar end so the Ergo Control IIs offer excellent stability when you're using them for out-of-the-saddle climbing.