  An up-to-date global QCD analysis of high energy lepton-hadron and
hadron-hadron interactions is performed to better determine the gluon and quark
parton distributions in the nucleon. Improved experimental data on inclusive
jet production, in conjunction with precise deep inelastic scattering data,
place good constraints on the gluon over a wide range of x; while new data on
asymmetries in Drell-Yan processes contribute to better determine the d/u
ratio. Comparisons with results of other recent global analyses are made, and
the differences are described. Open issues and the general problem of
determining the uncertainties of parton distributions are discussed.
