  Since the successful launch of NASA's dedicated gamma-ray burst (GRB)
mission, Swift, the study of cosmological GRBs has entered a new era. Here I
review the rapid observational and theoretical progress in this dynamical
research field during the first two-year of the Swift mission, focusing on how
observational breakthroughs have revolutionized our understanding of the
physical origins of GRBs. Besides summarizing how Swift helps to solve some
pre-Swift mysteries, I also list some outstanding problems raised by the Swift
observations. An outlook of GRB science in the future, especially in the GLAST
era, is briefly discussed.
