  We review the resummation of threshold logarithms for heavy quark, dijet,
direct photon, and W boson production cross sections in hadronic collisions.
Beyond leading logarithms the resummed cross section is sensitive to the color
exchange in the hard scattering. The resummation is formulated at
next-to-leading logarithmic or higher accuracy in terms of anomalous dimension
matrices which describe the factorization of soft gluons from the hard
scattering. We give results for the soft anomalous dimension matrices at one
loop for the full range of partonic subprocesses involved in heavy quark,
dijet, direct photon, and W boson production. We discuss the general
diagonalization procedure that can be implemented for the calculation of the
resummed cross sections, and we give numerical results for top quark production
at the Fermilab Tevatron. We also present analytical results for the one- and
two-loop expansions of the resummed cross sections.
