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The generalized Chaplygin gas (GCG) model allows for an unified descriptionof the recent accelerated expansion of the Universe and the evolution of energydensity perturbations. This dark energy - dark matter unification is achievedthrough an exotic background fluid whose equation of state is given by $p = -A/\rho^{\alpha}$, where $A$ is a positive constant and $0 < \alpha \le 1$.Stringent constraints on the model parameters can be obtained from recent WMAPand BOOMERanG bounds on the locations of the first few peaks and troughs of theCosmic Microwave Background Radiation (CMBR) power spectrum as well as SNe Iadata.Comment: 9 pages, 2 figures; essay selected for an honorable mention by the  Gravity Research Foundation, 200

Letter: Generalized Chaplygin Gas Model: Dark Energy—Dark Matter Unification and CMBR Constraints