Weight / Fat loss

Do you drop the weight as you go through the sets?
4-6 @ near max, 8-10 @ 80%, 40 @ 40-60%?

I tend to do 3 sets of 8, no rest between @ 80-90% max.
Try and do them 3 times in a master set.
Then do low weight, high rep sets on 3 major muscle groups.
I'm not looking for massive muscle gain though. Functional power ftw!

(having said this I've only been to the gym 2ce last week, swimming is taking over- planning on changing that balance next week)

Tends to be spread around different exercises, so legs day goes something like this:
Warm Up: 20 minute run to gym
Power Set: Squats: 4 sets of 4-6 rep 100kg+bar (120kg total)
Power Set: Romanian (Straight leg) deadlifts: 4 sets of 4-6 rep 90kg+bar
Muscle Sets: Inc Leg Press: 4 sets of 10 reps, 240kg

                  Leg Curls (machine): 4 sets of 10 reps 122.5kg
                  Front Squat: 3 sets of 8 reps, 40kg+bar 

Burn Sets: Inc Leg Press: 2 sets of 40 reps at 120kg

              Leg Curls (Machine) 1 set of 40 reps at 60kg

Result = inability to walk normally for several days
The burn sets are the real killer, should be done with a weight that allows you to get maybe 20 consecutive reps completed, then simply pushed through to 40 reps with mini rests that allow you to recover just enough for 1 or 2 more reps. Lots of warm up and stretching required before power sets, done to maximum effort with up to 2 minutes recovery between each power set. 30-60 sec recovery between each muscle set. Think the combination of different rep ranges really helps build "complete" strength, good power increases combined with decent power endurance gains, if that makes sense. I've certainly found far better results training like this than the standard 4x8 rep stuff and 14,12,8,6 rep pyramid training I was doing before.