1. You can do a set for one muscle group and immediately follow it with another for the same group. This method increases fatigue and is best for hypertrophy. Likewise, you could do a compound movement for a large muscle group and super set that with a movement for a smaller support group. An example would be combining a chest movement with a tricep movement.
2. You can do super sets with antagonist or opposing muscle groups. This creates an interesting synergistic effect. While you're working one group, the other is forced to relax more than normal to facilitate the motion. This improves set to set recovery. An example would be bench presses (chest) and rows (back).
-------------- "Don't follow leaders and watch your parking meters!" -- Bob Dylan