  We construct in the supergravity framework a relation between thermal
chargeless non-extremal black three-branes and thermal Dirichlet
branes-antibranes systems. We propose this relation as a possible explanation
for the intriguing similarity between the black branes Bekenstein-Hawking
entropy and the field theory entropy of thermal branes-antibranes. We comment
on various relations between branes, antibranes and non-BPS branes in type II
string theories.
