There's a drill called pedaling arcs that is supposed to really help pedaling technique: Divid the circle your pedal makes when cranking into 4 equally-sized arcs; top, front, bottom, rear. For a minute of riding, only apply force in the bottom arc. Then a minute in the rear arc. Then the top arc. Don't work on the front arc, because that's where most of us apply most of our force anyways. Work on those three arcs, and then concentrate on the full circle. You might go faster.