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Glass bottles make significantly better containers for carbonated beverages due to the fact that air can diffuse through plastic, allowing the CO2 to escape. Thus, carbonated beverages stored in plastic containers have a much shorter shelf life than their glass counterparts.
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But what about aluminum cans?
@Richard: If I remember correctly, glass also retains the carbonation longer than aluminum cans. However, aluminum cans will retain carbonation longer than plastic bottles.
Is this why plastic bottles of soda always seem so over-gassed? Compensating for possible CO2 loss between manufacture and consumption? Way too fizzy compared to bottled or especially soda fountain.