  With the recent high statistics Au+Au and Cu+Cu runs at RHIC, it has become
possible to systematically study jet properties in several different colliding
systems with potentially different final state interactions. In this talk we
present results from high-pT di-hadron and gamma-hadron correlations from p+p,
d+Au, Cu+Cu, and Au+Au collisions where jets in vacuum, cold nuclear matter,
and hot, dense nuclear matter are studied.
