I've been incorporating this and it's a nice switch up that incorporates high and low volume with drop sets.

First set. Weight that you can just get 10-12 reps with
Second set. Weight that you can just get 6-8 reps with
Third set. Weight that you can just get 4-6 reps with
Immediately following the third set, use a weight that you can hit 20 reps with. 45- 60 second rest in between first three sets.

You can use this method for all muscle groups.

Hope this gives someone some change for a bit.

-Mickey.