  The gluon collisional width in hot QCD plasmas is discussed with emphasis on
temperatures near $T_c$, where the coupling is large. Considering its effect on
the entropy, which is known from lattice calculations, it is argued that the
width, which in the perturbative limit is given by $\gamma \sim g^2 \ln(1/g)
T$, should be sizeable at intermediate temperatures but has to be small close
to $T_c$. Implications of these results for several phenomenologically relevant
quantities, such as the energy loss of hard jets, are pointed out.
