Agreed with Jokaman: The Widowmaker
It's called the Widowmaker because you're actually supposed to be using your 10 rep max to start and moving on from there. Using a "light" weight really isn't the original idea. On the other hand, if you are doing a 20 repper as the last set or something, then you probably won't be able to do your 10 rep max anyway. I still think it should be moderately heavy though, at least heavy enough so that @ 20 reps your lungs are on fire.
'Super Squats' was written to be done for ~6 weeks, workouts 2-3 times per week with a 20 repper every training day. You start with your 10 rep max and increase the weight from there.
@Mike: Again, not everyone wants to be small and "fit". Some people want to be big. Not everyone gives a shit about function. I've seen that argument a lot: "ZOMG it's not functional" to which the response by the bigger, stronger person usually answering the comment by someone small and weak "I don't care, and you're still small".
It could be argued that Olyympic lifting isn't all that great either, but I like doing it. Some people don't want to be just average bro. Some us lift, grunt, yell and otherwise look like we are murderously possessed when we train. Again, not everyone wants to be average.