Most of the replies so far have concentrated on achieving maximum range during the glide. But one day I found myself 4 miles from the airfield at 8000ft, so needed to reduce altitude quickly. The plan was Full 40 degree flaps and fly just below 80 knots by pushing the nose down. It worked very well maybe 3000 fpm+ descent rate.
Also for all those glider pilots amongst us, Full Airbrakes and side slip usually gives a glide slope of over 45 degrees.
Hope this helps, in case you ever have too much altitude.