I've always thought of the human body as an engine: provide the right fuel and additives and the sky is the limit.
This is what I put in my tank apart from healthy food:
Proteins: Twinlab Super Mass Gainer (just before I hit the sack)
Amino Acids: Aminobolan after a heavy workout (free form aminos: tastes like shit, but great for recuperation)
Twinlab HMB before a long cardio workout
Twinlab BCAA's before a strength (muscle) workout
Creatine (cycles of three weeks with one week abstinence):
10 grams Perfect Creatine Monohydrate on calm days
3 x 10 grams Maximize Betamax (creatine + HMB + arginine AKG = Nox booster) on "heavy duty" days
Vitamin supplements:on a daily basis, normal serving
All of the above works like a charm for me since I combine boxing with power training and need a little extra (min. 8 hours of training per week takes its toll).
I've tried Ripped Fuel and Anti Fat Fuel from Twinlab, but I can't say it had any significant results. In general I'm quite sceptic about burners, but maybe that's because I expect too much result from it, dunno.
I think the ground rule with using supplements is reading up on facts and realizing that supplements are nothing but aides, not miracle providers. Do a little research on the active components, combine that with the goals you're setting and check it with the nutritional info on the packages.
So what's the rest of the board swallowing?