  We present the latest velocities for 10 multi-planet systems, including a
re-analysis of archival Keck and Lick data, resulting in improved velocities
that supersede our previously published measurements. We derive updated orbital
fits for ten Lick and Keck systems, including two systems (HD 11964, HD 183263)
for which we provide confirmation of second planets only tentatively identified
elsewhere, and two others (HD 187123, and HD 217107) for which we provide a
major revision of the outer planet's orbit. We compile orbital elements from
the literature to generate a catalog of the 28 published multiple-planet
systems around stars within 200 pc. From this catalog we find several
intriguing patterns emerging: - Including those systems with long-term radial
velocity trends, at least 28% of known planetary systems appear to contain
multiple planets. - Planets in multiple-planet systems have somewhat smaller
eccentricities than single planets. - The distribution of orbital distances of
planets in multi-planet systems and single planets are inconsistent:
single-planet systems show a pile-up at P ~ 3 days and a jump near 1 AU, while
multi-planet systems show a more uniform distribution in log-period. In
addition, among all planetary systems we find: - There may be an emerging,
positive correlation between stellar mass and giant-planet semi-major axis. -
Exoplanets more massive than Jupiter have eccentricities broadly distributed
across 0 < e < 0.5, while lower-mass exoplanets exhibit a distribution peaked
near e = 0.
