Theoretical approaches to strange and other types of quark matter accounted
for at the SQM2003 Meeting are reviewed. They range from simple statistical
models through perturbative QCD supported mico-dynamical simulations til
lattice gauge theory and astrophysics results. Finally some ideas for future
research in this field are outlined.Comment: Theory summary talk given at Strange Quark Matter 2003 Conference,
March 12-17, 2003, Atlantic Beach, NC, USA. (LateX 19 pages, 15 postscript
figures.