  We review the orbital dynamics exhibited by the first extra-solar planetary
system discovered, Upsilon Andromedae. This system is unique in combining all
of the surprising architectural features displayed individually by extrasolar
planetary systems found today: (1) a hot Jupiter, (2) two planets on highly
eccentric orbits, and (3) a stellar companion. We discuss the system's
stability properties and its possible origin. Planet-disk interactions seem
critical to the emerging story.
