Also on road descents if it is to fast to pedal or to steep. Level your pedals to three and nine, and snuggly hold the top tube with your knees. Don't hold really tight just so that you feel you have control, this will help you steer the bike by shifting your weight. Kind of like a horse you press in a little more with the direction you want to go.

Oh and if you love descending like I do get in the drops, level your pedals, knees against the top tube,crouch foreward on the nose of the saddle, pick your butt up off the seat a few inches, and then get your chin as close to the bars as you can. Now just let your bike follow the fall line of the hill. Great for speed but not if you are afraide of speed. Oh when doing this be sure to watch the road far enough ahead that you can make course corrections, or they maybe scraping your skin up off the road for a while.