1. Introduction
1.1. The Detection of Multiple-Planet Systems
1.2. Multiple-Planet Systems and Planet Formation Theory
1.3. Plan
2. A Survey of the Known Multiple-Planet Systems
2.1. New and Updated Multi Planet Systems
2.2. The Current Sample
2.3. The Multiplicity Rate
2.4. Kinematic vs. Dynamical Fits
3. Statistics of Multiple-Planet Systems
3.1. Semimajor Axis Distributions
3.2. $M\sin i$
3.3. Eccentricity
3.4. Metallicity
3.5. Stellar Mass
3.6. Multiplicity vs. Stellar Mass
3.7. Eccentricity vs. $M\sin i$
3.8. Eccentricity vs. Metallicity
3.9. Eccentricity vs. Semimajor Axis
3.10. Ratio of Escape Speeds vs. Eccentricity
3.11. Metallicity and Stellar Mass vs. $M\sin i$
3.12. Semimajor Axis vs. Stellar Mass
3.13. Mass Ratio
4. Summary and Discussion