Rewinding this thread again: I will usually suggest starting with the lowest common denominator, and that would be 1 or 2 sets, when approaching a full body workout. If the need is felt, than try adding one more set to the compound exercises, making 3 sets the maxium done. The smaller stuff, like laterial raises, abs or arm's, can gain quite well with that original 1 or 2 sets. Though with all the slick T&A mag's, video's, book's, etc you would not think that possible.
HedgeHog give another slant on the workouts, with more variety of exercises. Lot's of guy's like that more because it can spice up the workouts and, at times, relieve boredom. The mental approach is most always more important than the physical one for most workouts anyway. Some will change up the rep scheme each workout also. I will not mention the "F" word, but just to say than exhausting the CNS in every workout is not the goal. Of all the key elements for steady gains & growth, the recovery of the body can be of major importance. Good Luck.